diff --git a/HACKING.rst b/HACKING.rst
index f961884..bb55ac5 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -363,13 +363,24 @@
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 When adding tests for new features that were not in previous releases of the
-projects the new test has to be properly skipped with a feature flag. Whether
-this is just as simple as using the @utils.requires_ext() decorator to
-check if the required extension (or discoverable optional API) is enabled or
+projects the new test has to be properly skipped with a feature flag. This can
+be just as simple as using the ``@utils.requires_ext()`` or
+``testtools.skipUnless`` decorators to check if the required extension (or
+discoverable optional API) or feature is enabled or can be as difficult as
 adding a new config option to the appropriate section. If there isn't a method
 of selecting the new **feature** from the config file then there won't be a
-mechanism to disable the test with older stable releases and the new test won't
-be able to merge.
+mechanism to disable the test with older stable releases and the new test
+won't be able to merge.
+
+Introduction of a new feature flag requires specifying a default value for
+the corresponding config option that is appropriate in the latest OpenStack
+release. Because Tempest is branchless, the feature flag's default value will
+need to be overridden to a value that is appropriate in earlier releases
+in which the feature isn't available. In DevStack, this can be accomplished
+by modifying Tempest's `lib installation script`_ for previous branches
+(because DevStack is branched).
+
+.. _lib installation script: http://git.openstack.org/cgit/openstack-dev/devstack/tree/lib/tempest
 
 2. Bug fix on core project needing Tempest changes
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/releasenotes/notes/vnc-hardcoded-server-name-removed-6f8d1e90a175dc08.yaml b/releasenotes/notes/vnc-hardcoded-server-name-removed-6f8d1e90a175dc08.yaml
new file mode 100644
index 0000000..0da2ddc
--- /dev/null
+++ b/releasenotes/notes/vnc-hardcoded-server-name-removed-6f8d1e90a175dc08.yaml
@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    New string configuration option ``vnc_server_header`` is added
+    to ``compute-feature-enabled`` section. It offers to provide VNC server
+    name that is to be expected in the responce header. For example, obvious
+    at hand names is 'WebSockify', 'nginx'.
+fixes:
+  - |
+    Fix VNC server response header issue when it is behind reverse proxy
diff --git a/tempest/api/compute/admin/test_aggregates_negative.py b/tempest/api/compute/admin/test_aggregates_negative.py
index 6df8410..a6e0efa 100644
--- a/tempest/api/compute/admin/test_aggregates_negative.py
+++ b/tempest/api/compute/admin/test_aggregates_negative.py
@@ -27,15 +27,16 @@
     def setup_clients(cls):
         super(AggregatesAdminNegativeTestJSON, cls).setup_clients()
         cls.client = cls.os_admin.aggregates_client
-        cls.hyper_client = cls.os_admin.hypervisor_client
+        cls.services_client = cls.os_admin.services_client
 
     @classmethod
     def resource_setup(cls):
         super(AggregatesAdminNegativeTestJSON, cls).resource_setup()
         cls.aggregate_name_prefix = 'test_aggregate'
 
-        hyper_list = cls.hyper_client.list_hypervisors()['hypervisors']
-        cls.hosts = [v['hypervisor_hostname'] for v in hyper_list
+        svc_list = cls.services_client.list_services(
+            binary='nova-compute')['services']
+        cls.hosts = [v['host'] for v in svc_list
                      if v['status'] == 'enabled' and v['state'] == 'up']
 
     def _create_test_aggregate(self):
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index 9759be7..760e356 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -532,10 +532,10 @@
     def get_host_other_than(self, server_id):
         source_host = self.get_host_for_server(server_id)
 
-        hypers = self.os_admin.hypervisor_client.list_hypervisors(
-            )['hypervisors']
-        hosts = [hyper['hypervisor_hostname'] for hyper in hypers
-                 if hyper['state'] == 'up' and hyper['status'] == 'enabled']
+        svcs = self.os_admin.services_client.list_services(
+            binary='nova-compute')['services']
+        hosts = [svc['host'] for svc in svcs
+                 if svc['state'] == 'up' and svc['status'] == 'enabled']
 
         for target_host in hosts:
             if source_host != target_host:
diff --git a/tempest/api/compute/servers/test_create_server.py b/tempest/api/compute/servers/test_create_server.py
index c660821..122c4f5 100644
--- a/tempest/api/compute/servers/test_create_server.py
+++ b/tempest/api/compute/servers/test_create_server.py
@@ -135,8 +135,13 @@
             servers_client=self.client)
         hostname = linux_client.exec_command("hostname").rstrip()
         msg = ('Failed while verifying servername equals hostname. Expected '
-               'hostname "%s" but got "%s".' % (self.name, hostname))
-        self.assertEqual(self.name.lower(), hostname, msg)
+               'hostname "%s" but got "%s".' %
+               (self.name, hostname.split(".")[0]))
+        # NOTE(zhufl): Some images will add postfix for the hostname, e.g.,
+        # if hostname is "aaa", postfix ".novalocal" may be added to it, and
+        # the hostname will be "aaa.novalocal" then, so we should ignore the
+        # postfix when checking whether hostname equals self.name.
+        self.assertEqual(self.name.lower(), hostname.split(".")[0], msg)
 
 
 class ServersTestManualDisk(ServersTestJSON):
diff --git a/tempest/api/compute/servers/test_device_tagging.py b/tempest/api/compute/servers/test_device_tagging.py
index 43046ca..b0d527c 100644
--- a/tempest/api/compute/servers/test_device_tagging.py
+++ b/tempest/api/compute/servers/test_device_tagging.py
@@ -47,8 +47,8 @@
             raise cls.skipException('Neutron is required')
         if not CONF.validation.run_validation:
             raise cls.skipException('Validation must be enabled')
-        if (not CONF.compute_feature_enabled.config_drive
-            and not CONF.compute_feature_enabled.metadata_service):
+        if (not CONF.compute_feature_enabled.config_drive and
+                not CONF.compute_feature_enabled.metadata_service):
             raise cls.skipException('One of metadata or config drive must be '
                                     'enabled')
 
diff --git a/tempest/api/compute/servers/test_novnc.py b/tempest/api/compute/servers/test_novnc.py
index d9581e3..1dfd0f9 100644
--- a/tempest/api/compute/servers/test_novnc.py
+++ b/tempest/api/compute/servers/test_novnc.py
@@ -151,11 +151,22 @@
         self.assertTrue(
             self._websocket.response.startswith(b'HTTP/1.1 101 Switching '
                                                 b'Protocols\r\n'),
-            'Did not get the expected 101 on the websockify call: '
-            + six.text_type(self._websocket.response))
-        self.assertTrue(
-            self._websocket.response.find(b'Server: WebSockify') > 0,
-            'Did not get the expected WebSocket HTTP Response.')
+            'Did not get the expected 101 on the {} call: {}'.format(
+                CONF.compute_feature_enabled.vnc_server_header,
+                six.text_type(self._websocket.response)
+            )
+        )
+        # Since every other server type returns Headers with different case
+        # (for example 'nginx'), lowercase must be applied to eliminate issues.
+        _desired_header = "server: {0}".format(
+            CONF.compute_feature_enabled.vnc_server_header
+        ).lower()
+        _response = six.text_type(self._websocket.response).lower()
+        self.assertIn(
+            _desired_header,
+            _response,
+            'Did not get the expected WebSocket HTTP Response.'
+        )
 
     @decorators.idempotent_id('c640fdff-8ab4-45a4-a5d8-7e6146cbd0dc')
     def test_novnc(self):
diff --git a/tempest/api/image/v1/test_images.py b/tempest/api/image/v1/test_images.py
index 76723f4..2432c8b 100644
--- a/tempest/api/image/v1/test_images.py
+++ b/tempest/api/image/v1/test_images.py
@@ -132,8 +132,8 @@
     @classmethod
     def skip_checks(cls):
         super(ListImagesTest, cls).skip_checks()
-        if (len(CONF.image.container_formats) < 2
-           or len(CONF.image.disk_formats) < 2):
+        if (len(CONF.image.container_formats) < 2 or
+                len(CONF.image.disk_formats) < 2):
             skip_msg = ("%s skipped as multiple container formats "
                         "or disk formats are not available." % cls.__name__)
             raise cls.skipException(skip_msg)
@@ -227,8 +227,8 @@
             self.assertEqual(image['disk_format'], self.disk_format_alt)
         result_set = set(map(lambda x: x['id'], images_list))
         self.assertTrue(self.same_disk_format_set <= result_set)
-        self.assertFalse(self.created_set - self.same_disk_format_set
-                         <= result_set)
+        self.assertFalse(self.created_set - self.same_disk_format_set <=
+                         result_set)
 
     @decorators.idempotent_id('2143655d-96d9-4bec-9188-8674206b4b3b')
     def test_index_container_format(self):
@@ -238,8 +238,8 @@
             self.assertEqual(image['container_format'], self.container_format)
         result_set = set(map(lambda x: x['id'], images_list))
         self.assertTrue(self.same_container_format_set <= result_set)
-        self.assertFalse(self.created_set - self.same_container_format_set
-                         <= result_set)
+        self.assertFalse(self.created_set - self.same_container_format_set <=
+                         result_set)
 
     @decorators.idempotent_id('feb32ac6-22bb-4a16-afd8-9454bb714b14')
     def test_index_max_size(self):
diff --git a/tempest/api/volume/admin/test_volume_hosts.py b/tempest/api/volume/admin/test_volume_hosts.py
index ce0cbd2..7e53ce8 100644
--- a/tempest/api/volume/admin/test_volume_hosts.py
+++ b/tempest/api/volume/admin/test_volume_hosts.py
@@ -46,8 +46,8 @@
         # show host API should fail (return code: 404). The cinder-volume host
         # is presented in format: <host-name>@driver-name.
         c_vol_hosts = [host['host_name'] for host in hosts
-                       if (host['service'] == 'cinder-volume'
-                           and host['service-state'] == 'enabled')]
+                       if (host['service'] == 'cinder-volume' and
+                           host['service-state'] == 'enabled')]
         self.assertNotEmpty(c_vol_hosts,
                             "No available cinder-volume host is found, "
                             "all hosts that found are: %s" % hosts)
diff --git a/tempest/api/volume/test_volumes_extend.py b/tempest/api/volume/test_volumes_extend.py
index 54052ae..362f4cc 100644
--- a/tempest/api/volume/test_volumes_extend.py
+++ b/tempest/api/volume/test_volumes_extend.py
@@ -32,7 +32,7 @@
     @decorators.idempotent_id('9a36df71-a257-43a5-9555-dc7c88e66e0e')
     def test_volume_extend(self):
         # Extend Volume Test.
-        volume = self.create_volume()
+        volume = self.create_volume(image_ref=self.image_ref)
         extend_size = volume['size'] + 1
         self.volumes_client.extend_volume(volume['id'],
                                           new_size=extend_size)
diff --git a/tempest/api/volume/test_volumes_snapshots.py b/tempest/api/volume/test_volumes_snapshots.py
index dcd3518..52114bc 100644
--- a/tempest/api/volume/test_volumes_snapshots.py
+++ b/tempest/api/volume/test_volumes_snapshots.py
@@ -41,16 +41,19 @@
     def test_snapshot_create_delete_with_volume_in_use(self):
         # Create a test instance
         server = self.create_server()
-        self.attach_volume(server['id'], self.volume_origin['id'])
+        # NOTE(zhufl) Here we create volume from self.image_ref for adding
+        # coverage for "creating snapshot from non-blank volume".
+        volume = self.create_volume(image_ref=self.image_ref)
+        self.attach_volume(server['id'], volume['id'])
 
         # Snapshot a volume which attached to an instance with force=False
         self.assertRaises(lib_exc.BadRequest, self.create_snapshot,
-                          self.volume_origin['id'], force=False)
+                          volume['id'], force=False)
 
         # Snapshot a volume attached to an instance
-        snapshot1 = self.create_snapshot(self.volume_origin['id'], force=True)
-        snapshot2 = self.create_snapshot(self.volume_origin['id'], force=True)
-        snapshot3 = self.create_snapshot(self.volume_origin['id'], force=True)
+        snapshot1 = self.create_snapshot(volume['id'], force=True)
+        snapshot2 = self.create_snapshot(volume['id'], force=True)
+        snapshot3 = self.create_snapshot(volume['id'], force=True)
 
         # Delete the snapshots. Some snapshot implementations can take
         # different paths according to order they are deleted.
diff --git a/tempest/api/volume/test_volumes_snapshots_list.py b/tempest/api/volume/test_volumes_snapshots_list.py
index 507df1f..f12bfd8 100644
--- a/tempest/api/volume/test_volumes_snapshots_list.py
+++ b/tempest/api/volume/test_volumes_snapshots_list.py
@@ -28,13 +28,11 @@
     @classmethod
     def resource_setup(cls):
         super(VolumesSnapshotListTestJSON, cls).resource_setup()
-        cls.snapshot_id_list = []
         volume_origin = cls.create_volume()
 
         # Create snapshots with params
         for _ in range(3):
             snapshot = cls.create_snapshot(volume_origin['id'])
-            cls.snapshot_id_list.append(snapshot['id'])
         cls.snapshot = snapshot
 
     def _list_by_param_values_and_assert(self, with_detail=False, **params):
@@ -151,10 +149,14 @@
     @decorators.idempotent_id('05489dde-44bc-4961-a1f5-3ce7ee7824f7')
     def test_snapshot_list_param_marker(self):
         # The list of snapshots should end before the provided marker
-        params = {'marker': self.snapshot_id_list[1]}
+        snap_list = self.snapshots_client.list_snapshots()['snapshots']
+        # list_snapshots will take the reverse order as they are created.
+        snapshot_id_list = [snap['id'] for snap in snap_list][::-1]
+
+        params = {'marker': snapshot_id_list[1]}
         snap_list = self.snapshots_client.list_snapshots(**params)['snapshots']
         fetched_list_id = [snap['id'] for snap in snap_list]
         # Verify the list of snapshots ends before the provided
         # marker(second snapshot), therefore only the first snapshot
         # should displayed.
-        self.assertEqual(self.snapshot_id_list[:1], fetched_list_id)
+        self.assertEqual(snapshot_id_list[:1], fetched_list_id)
diff --git a/tempest/cmd/cleanup_service.py b/tempest/cmd/cleanup_service.py
index 025959a..27e1bc1 100644
--- a/tempest/cmd/cleanup_service.py
+++ b/tempest/cmd/cleanup_service.py
@@ -104,11 +104,11 @@
             self.tenant_filter['tenant_id'] = self.tenant_id
 
     def _filter_by_tenant_id(self, item_list):
-        if (item_list is None
-                or not item_list
-                or not hasattr(self, 'tenant_id')
-                or self.tenant_id is None
-                or 'tenant_id' not in item_list[0]):
+        if (item_list is None or
+                not item_list or
+                not hasattr(self, 'tenant_id') or
+                self.tenant_id is None or
+                'tenant_id' not in item_list[0]):
             return item_list
 
         return [item for item in item_list
@@ -816,8 +816,8 @@
             if not self.is_save_state:
                 roles = [role for role in roles if
                          (role['id'] not in
-                          self.saved_state_json['roles'].keys()
-                          and role['name'] != CONF.identity.admin_role)]
+                          self.saved_state_json['roles'].keys() and
+                          role['name'] != CONF.identity.admin_role)]
                 LOG.debug("List count, %s Roles after reconcile", len(roles))
             return roles
         except Exception:
@@ -852,13 +852,16 @@
     def list(self):
         projects = self.client.list_projects()['projects']
         if not self.is_save_state:
-            projects = [project for project in projects if (project['id']
-                        not in self.saved_state_json['projects'].keys()
-                        and project['name'] != CONF.auth.admin_project_name)]
+            project_ids = self.saved_state_json['projects']
+            projects = [project
+                        for project in projects
+                        if (project['id'] not in project_ids and
+                            project['name'] != CONF.auth.admin_project_name)]
 
         if self.is_preserve:
-            projects = [project for project in projects if project['name']
-                        not in CONF_PROJECTS]
+            projects = [project
+                        for project in projects
+                        if project['name'] not in CONF_PROJECTS]
 
         LOG.debug("List count, %s Projects after reconcile", len(projects))
         return projects
diff --git a/tempest/config.py b/tempest/config.py
index 5d27efd..a2ccb84 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -407,6 +407,10 @@
                 default=False,
                 help='Enable VNC console. This configuration value should '
                      'be same as [nova.vnc]->vnc_enabled in nova.conf'),
+    cfg.StrOpt('vnc_server_header',
+               default='WebSockify',
+               help='Expected VNC server name (WebSockify, nginx, etc) '
+                    'in response header.'),
     cfg.BoolOpt('spice_console',
                 default=False,
                 help='Enable Spice console. This configuration value should '
diff --git a/tempest/hacking/checks.py b/tempest/hacking/checks.py
index aae685c..b6e7f8c 100644
--- a/tempest/hacking/checks.py
+++ b/tempest/hacking/checks.py
@@ -228,12 +228,12 @@
     if 'tempest/lib/' not in filename:
         return
 
-    if not ('from tempest' in logical_line
-            or 'import tempest' in logical_line):
+    if not ('from tempest' in logical_line or
+            'import tempest' in logical_line):
         return
 
-    if ('from tempest.lib' in logical_line
-        or 'import tempest.lib' in logical_line):
+    if ('from tempest.lib' in logical_line or
+            'import tempest.lib' in logical_line):
         return
 
     msg = ("T112: tempest.lib should not import local tempest code to avoid "
@@ -266,9 +266,9 @@
     if 'tempest/lib/' not in filename:
         return
 
-    if ('tempest.config' in logical_line
-        or 'from tempest import config' in logical_line
-        or 'oslo_config' in logical_line):
+    if ('tempest.config' in logical_line or
+            'from tempest import config' in logical_line or
+            'oslo_config' in logical_line):
         msg = ('T114: tempest.lib can not have any dependency on tempest '
                'config.')
         yield(0, msg)
diff --git a/tempest/lib/base.py b/tempest/lib/base.py
index 33a32ee..3be55c0 100644
--- a/tempest/lib/base.py
+++ b/tempest/lib/base.py
@@ -43,8 +43,7 @@
         super(BaseTestCase, self).setUp()
         if not self.setUpClassCalled:
             raise RuntimeError("setUpClass does not calls the super's "
-                               "setUpClass in the "
-                               + self.__class__.__name__)
+                               "setUpClass in {!r}".format(type(self)))
         test_timeout = os.environ.get('OS_TEST_TIMEOUT', 0)
         try:
             test_timeout = int(test_timeout)
@@ -62,7 +61,7 @@
             stderr = self.useFixture(fixtures.StringStream('stderr')).stream
             self.useFixture(fixtures.MonkeyPatch('sys.stderr', stderr))
         if (os.environ.get('OS_LOG_CAPTURE') != 'False' and
-            os.environ.get('OS_LOG_CAPTURE') != '0'):
+                os.environ.get('OS_LOG_CAPTURE') != '0'):
             self.useFixture(fixtures.LoggerFixture(nuke_handlers=False,
                                                    format=self.log_format,
                                                    level=None))
diff --git a/tempest/lib/cli/output_parser.py b/tempest/lib/cli/output_parser.py
index 2edd5c1..a7d5e49 100644
--- a/tempest/lib/cli/output_parser.py
+++ b/tempest/lib/cli/output_parser.py
@@ -37,8 +37,8 @@
     items = []
     tables_ = tables(output_lines)
     for table_ in tables_:
-        if ('Property' not in table_['headers']
-            or 'Value' not in table_['headers']):
+        if ('Property' not in table_['headers'] or
+                'Value' not in table_['headers']):
             raise exceptions.InvalidStructure()
         item = {}
         for value in table_['values']:
diff --git a/tempest/lib/cmd/check_uuid.py b/tempest/lib/cmd/check_uuid.py
index 101d692..d1f0888 100755
--- a/tempest/lib/cmd/check_uuid.py
+++ b/tempest/lib/cmd/check_uuid.py
@@ -103,7 +103,7 @@
     def _modules_search(self):
         """Recursive search for python modules in base package"""
         modules = []
-        for root, dirs, files in os.walk(self.base_path):
+        for root, _, files in os.walk(self.base_path):
             if not os.path.exists(os.path.join(root, '__init__.py')):
                 continue
             root_package = self._path_to_package(root)
@@ -121,10 +121,10 @@
         idempotent_id = None
         for decorator in test_node.decorator_list:
             if (hasattr(decorator, 'func') and
-                hasattr(decorator.func, 'attr') and
-                decorator.func.attr == DECORATOR_NAME and
-                hasattr(decorator.func, 'value') and
-                decorator.func.value.id == DECORATOR_MODULE):
+                    hasattr(decorator.func, 'attr') and
+                    decorator.func.attr == DECORATOR_NAME and
+                    hasattr(decorator.func, 'value') and
+                    decorator.func.value.id == DECORATOR_MODULE):
                 for arg in decorator.args:
                     idempotent_id = ast.literal_eval(arg)
         return idempotent_id
@@ -165,8 +165,8 @@
 
     @staticmethod
     def _is_test_method(node):
-        return (node.__class__ is ast.FunctionDef
-                and node.name.startswith('test_'))
+        return (node.__class__ is ast.FunctionDef and
+                node.name.startswith('test_'))
 
     @staticmethod
     def _next_node(body, node):
diff --git a/tempest/lib/common/dynamic_creds.py b/tempest/lib/common/dynamic_creds.py
index 4f1a883..f27e926 100644
--- a/tempest/lib/common/dynamic_creds.py
+++ b/tempest/lib/common/dynamic_creds.py
@@ -338,15 +338,15 @@
                 credentials = self._create_creds(roles=credential_type)
             self._creds[str(credential_type)] = credentials
             # Maintained until tests are ported
-            LOG.info("Acquired dynamic creds:\n credentials: %s", credentials)
-            if (self.neutron_available and
-                self.create_networks):
+            LOG.info("Acquired dynamic creds:\n"
+                     " credentials: %s", credentials)
+            if (self.neutron_available and self.create_networks):
                 network, subnet, router = self._create_network_resources(
                     credentials.tenant_id)
                 credentials.set_resources(network=network, subnet=subnet,
                                           router=router)
-                LOG.info("Created isolated network resources for : \n"
-                         + " credentials: %s", credentials)
+                LOG.info("Created isolated network resources for:\n"
+                         " credentials: %s", credentials)
         return credentials
 
     def get_primary_creds(self):
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index c78646f..cf53b67 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -662,8 +662,8 @@
                 addresses = (server['addresses'][network['name']]
                              if network else [])
             for address in addresses:
-                if (address['version'] == CONF.validation.ip_version_for_ssh
-                        and address['OS-EXT-IPS:type'] == 'fixed'):
+                if (address['version'] == CONF.validation.ip_version_for_ssh and  # noqa
+                        address['OS-EXT-IPS:type'] == 'fixed'):
                     return address['addr']
             raise exceptions.ServerUnreachable(server_id=server['id'])
         else:
@@ -792,8 +792,8 @@
         port_map = [(p["id"], fxip["ip_address"])
                     for p in ports
                     for fxip in p["fixed_ips"]
-                    if netutils.is_valid_ipv4(fxip["ip_address"])
-                    and p['status'] in p_status]
+                    if (netutils.is_valid_ipv4(fxip["ip_address"]) and
+                        p['status'] in p_status)]
         inactive = [p for p in ports if p['status'] != 'ACTIVE']
         if inactive:
             LOG.warning("Instance has ports that are not ACTIVE: %s", inactive)
diff --git a/tempest/scenario/test_aggregates_basic_ops.py b/tempest/scenario/test_aggregates_basic_ops.py
index f762995..b515639 100644
--- a/tempest/scenario/test_aggregates_basic_ops.py
+++ b/tempest/scenario/test_aggregates_basic_ops.py
@@ -37,7 +37,7 @@
         super(TestAggregatesBasicOps, cls).setup_clients()
         # Use admin client by default
         cls.aggregates_client = cls.os_admin.aggregates_client
-        cls.hyper_client = cls.os_admin.hypervisor_client
+        cls.services_client = cls.os_admin.services_client
 
     def _create_aggregate(self, **kwargs):
         aggregate = (self.aggregates_client.create_aggregate(**kwargs)
@@ -51,9 +51,10 @@
         return aggregate
 
     def _get_host_name(self):
-        hyper_list = self.hyper_client.list_hypervisors()['hypervisors']
-        self.assertNotEmpty(hyper_list)
-        return hyper_list[0]['hypervisor_hostname']
+        svc_list = self.services_client.list_services(
+            binary='nova-compute')['services']
+        self.assertNotEmpty(svc_list)
+        return svc_list[0]['host']
 
     def _add_host(self, aggregate_id, host):
         aggregate = (self.aggregates_client.add_host(aggregate_id, host=host)
diff --git a/tempest/scenario/test_network_advanced_server_ops.py b/tempest/scenario/test_network_advanced_server_ops.py
index e4ab11c..87ce951 100644
--- a/tempest/scenario/test_network_advanced_server_ops.py
+++ b/tempest/scenario/test_network_advanced_server_ops.py
@@ -43,8 +43,8 @@
     @classmethod
     def skip_checks(cls):
         super(TestNetworkAdvancedServerOps, cls).skip_checks()
-        if not (CONF.network.project_networks_reachable
-                or CONF.network.public_network_id):
+        if not (CONF.network.project_networks_reachable or
+                CONF.network.public_network_id):
             msg = ('Either project_networks_reachable must be "true", or '
                    'public_network_id must be defined.')
             raise cls.skipException(msg)
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index fd9c985..bcd4ddb 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -81,8 +81,8 @@
     @classmethod
     def skip_checks(cls):
         super(TestNetworkBasicOps, cls).skip_checks()
-        if not (CONF.network.project_networks_reachable
-                or CONF.network.public_network_id):
+        if not (CONF.network.project_networks_reachable or
+                CONF.network.public_network_id):
             msg = ('Either project_networks_reachable must be "true", or '
                    'public_network_id must be defined.')
             raise cls.skipException(msg)
diff --git a/tempest/scenario/test_network_v6.py b/tempest/scenario/test_network_v6.py
index 9f4e62b..e4e39c3 100644
--- a/tempest/scenario/test_network_v6.py
+++ b/tempest/scenario/test_network_v6.py
@@ -38,11 +38,11 @@
     @classmethod
     def skip_checks(cls):
         super(TestGettingAddress, cls).skip_checks()
-        if not (CONF.network_feature_enabled.ipv6
-                and CONF.network_feature_enabled.ipv6_subnet_attributes):
+        if not (CONF.network_feature_enabled.ipv6 and
+                CONF.network_feature_enabled.ipv6_subnet_attributes):
             raise cls.skipException('IPv6 or its attributes not supported')
-        if not (CONF.network.project_networks_reachable
-                or CONF.network.public_network_id):
+        if not (CONF.network.project_networks_reachable or
+                CONF.network.public_network_id):
             msg = ('Either project_networks_reachable must be "true", or '
                    'public_network_id must be defined.')
             raise cls.skipException(msg)
diff --git a/tempest/scenario/test_volume_boot_pattern.py b/tempest/scenario/test_volume_boot_pattern.py
index 7ceae89..1fc57e7 100644
--- a/tempest/scenario/test_volume_boot_pattern.py
+++ b/tempest/scenario/test_volume_boot_pattern.py
@@ -193,36 +193,57 @@
     @testtools.skipUnless(CONF.volume_feature_enabled.snapshot,
                           'Cinder volume snapshots are disabled')
     @utils.services('compute', 'volume', 'image')
-    def test_create_ebs_image_and_check_boot(self):
-        # create an instance from volume
+    def test_image_defined_boot_from_volume(self):
+        # create an instance from image-backed volume
         volume_origin = self._create_volume_from_image()
         instance = self._boot_instance_from_resource(
             source_id=volume_origin['id'],
             source_type='volume',
             delete_on_termination=True)
-        # create EBS image
+        # Create a snapshot image from the volume-backed server.
+        # The compute service will have the block service create a snapshot of
+        # the root volume and store its metadata in the image.
         image = self.create_server_snapshot(instance)
 
-        # delete instance
+        # Delete the first server which will also delete the first image-backed
+        # volume.
         self._delete_server(instance)
 
-        # boot instance from EBS image
+        # Create a server from the image snapshot which has an
+        # "image-defined block device mapping (BDM)" in it, i.e. the metadata
+        # about the volume snapshot. The compute service will use this to
+        # create a volume from the volume snapshot and use that as the root
+        # disk for the server.
         instance = self.create_server(image_id=image['id'])
 
-        # Verify the server was created from the image
-        created_volume = instance['os-extended-volumes:volumes_attached']
-        self.assertNotEmpty(created_volume, "No volume attachment found.")
-        created_volume_info = self.volumes_client.show_volume(
-            created_volume[0]['id'])['volume']
+        # Verify the server was created from the image-defined BDM.
+        volume_attachments = instance['os-extended-volumes:volumes_attached']
+        self.assertEqual(1, len(volume_attachments),
+                         "No volume attachment found.")
+        created_volume = self.volumes_client.show_volume(
+            volume_attachments[0]['id'])['volume']
+        # Assert that the volume service also shows the server attachment.
+        self.assertEqual(1, len(created_volume['attachments']),
+                         "No server attachment found for volume: %s" %
+                         created_volume)
         self.assertEqual(instance['id'],
-                         created_volume_info['attachments'][0]['server_id'])
-        self.assertEqual(created_volume[0]['id'],
-                         created_volume_info['attachments'][0]['volume_id'])
+                         created_volume['attachments'][0]['server_id'])
+        self.assertEqual(volume_attachments[0]['id'],
+                         created_volume['attachments'][0]['volume_id'])
         self.assertEqual(
             volume_origin['volume_image_metadata']['image_id'],
-            created_volume_info['volume_image_metadata']['image_id'])
+            created_volume['volume_image_metadata']['image_id'])
 
-        # delete instance
+        # Delete the second server which should also delete the second volume
+        # created from the volume snapshot.
+        # TODO(mriedem): Currently, the compute service fails to delete the
+        # volume it created because the volume still has the snapshot
+        # associated with it, and the cleanups for the volume snapshot which
+        # were added in create_server_snapshot above, don't run until after
+        # this is called. So we need to delete the volume snapshot and wait for
+        # it to be gone here first before deleting the server, and then we can
+        # also assert that the underlying volume is deleted when the server is
+        # deleted.
         self._delete_server(instance)
 
     @decorators.idempotent_id('cb78919a-e553-4bab-b73b-10cf4d2eb125')
diff --git a/tempest/test.py b/tempest/test.py
index 27e0165..f2babbb 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -68,9 +68,9 @@
 def validate_tearDownClass():
     if at_exit_set:
         LOG.error(
-            "tearDownClass does not call the super's "
-            "tearDownClass in these classes: \n"
-            + str(at_exit_set))
+            "tearDownClass does not call the super's tearDownClass in "
+            "these classes:\n"
+            "  %s", at_exit_set)
 
 
 atexit.register(validate_tearDownClass)
@@ -582,8 +582,8 @@
         super(BaseTestCase, self).setUp()
         if not self.__setupclass_called:
             raise RuntimeError("setUpClass does not calls the super's"
-                               "setUpClass in the "
-                               + self.__class__.__name__)
+                               "setUpClass in the " +
+                               self.__class__.__name__)
         at_exit_set.add(self.__class__)
         test_timeout = os.environ.get('OS_TEST_TIMEOUT', 0)
         try:
@@ -602,7 +602,7 @@
             stderr = self.useFixture(fixtures.StringStream('stderr')).stream
             self.useFixture(fixtures.MonkeyPatch('sys.stderr', stderr))
         if (os.environ.get('OS_LOG_CAPTURE') != 'False' and
-            os.environ.get('OS_LOG_CAPTURE') != '0'):
+                os.environ.get('OS_LOG_CAPTURE') != '0'):
             self.useFixture(fixtures.LoggerFixture(nuke_handlers=False,
                                                    format=self.log_format,
                                                    level=None))