diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index 096941f..173ee83 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -75,7 +75,6 @@
             cls.os.compute_security_group_rules_client)
         cls.security_groups_client = cls.os.compute_security_groups_client
         cls.quotas_client = cls.os.quotas_client
-        cls.quota_classes_client = cls.os.quota_classes_client
         cls.compute_networks_client = cls.os.compute_networks_client
         cls.limits_client = cls.os.limits_client
         cls.volumes_extensions_client = cls.os.volumes_extensions_client
diff --git a/tempest/api/compute/images/test_images_negative.py b/tempest/api/compute/images/test_images_negative.py
index 7035401..c48367f 100644
--- a/tempest/api/compute/images/test_images_negative.py
+++ b/tempest/api/compute/images/test_images_negative.py
@@ -96,7 +96,7 @@
     def test_delete_non_existent_image(self):
         # Return an error while trying to delete a non-existent image
 
-        non_existent_image_id = '11a22b9-12a9-5555-cc11-00ab112223fa'
+        non_existent_image_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           non_existent_image_id)
 
@@ -110,9 +110,9 @@
     @test.idempotent_id('924540c3-f1f1-444c-8f58-718958b6724e')
     def test_delete_image_non_hex_string_id(self):
         # Return an error while trying to delete an image with non hex id
-        image_id = '11a22b9-120q-5555-cc11-00ab112223gj'
+        invalid_image_id = data_utils.rand_uuid()[:-1] + "j"
         self.assertRaises(lib_exc.NotFound, self.client.delete_image,
-                          image_id)
+                          invalid_image_id)
 
     @test.attr(type=['negative'])
     @test.idempotent_id('68e2c175-bd26-4407-ac0f-4ea9ce2139ea')
@@ -122,7 +122,8 @@
 
     @test.attr(type=['negative'])
     @test.idempotent_id('b340030d-82cd-4066-a314-c72fb7c59277')
-    def test_delete_image_id_is_over_35_character_limit(self):
+    def test_delete_image_with_id_over_character_limit(self):
         # Return an error while trying to delete image with id over limit
+        invalid_image_id = data_utils.rand_uuid() + "1"
         self.assertRaises(lib_exc.NotFound, self.client.delete_image,
-                          '11a22b9-12a9-5555-cc11-00ab112223fa-3fac')
+                          invalid_image_id)
diff --git a/tempest/api/compute/images/test_images_oneserver_negative.py b/tempest/api/compute/images/test_images_oneserver_negative.py
index d9b80e1..039283a 100644
--- a/tempest/api/compute/images/test_images_oneserver_negative.py
+++ b/tempest/api/compute/images/test_images_oneserver_negative.py
@@ -69,11 +69,6 @@
             raise cls.skipException(skip_msg)
 
     @classmethod
-    def setup_credentials(cls):
-        cls.prepare_instance_network()
-        super(ImagesOneServerNegativeTestJSON, cls).setup_credentials()
-
-    @classmethod
     def setup_clients(cls):
         super(ImagesOneServerNegativeTestJSON, cls).setup_clients()
         cls.client = cls.compute_images_client
diff --git a/tempest/api/compute/limits/test_absolute_limits.py b/tempest/api/compute/limits/test_absolute_limits.py
index 69811f4..6cc722c 100644
--- a/tempest/api/compute/limits/test_absolute_limits.py
+++ b/tempest/api/compute/limits/test_absolute_limits.py
@@ -35,9 +35,10 @@
                              'maxTotalFloatingIps', 'maxSecurityGroups',
                              'maxSecurityGroupRules', 'maxTotalInstances',
                              'maxTotalKeypairs', 'maxTotalRAMSize',
+                             'maxServerGroups', 'maxServerGroupMembers',
                              'totalCoresUsed', 'totalFloatingIpsUsed',
                              'totalSecurityGroupsUsed', 'totalInstancesUsed',
-                             'totalRAMUsed']
+                             'totalRAMUsed', 'totalServerGroupsUsed']
         # check whether all expected elements exist
         missing_elements =\
             [ele for ele in expected_elements if ele not in absolute_limits]
diff --git a/tempest/api/compute/servers/test_device_tagging.py b/tempest/api/compute/servers/test_device_tagging.py
index 9acc2b1..7252e1b 100644
--- a/tempest/api/compute/servers/test_device_tagging.py
+++ b/tempest/api/compute/servers/test_device_tagging.py
@@ -21,7 +21,7 @@
 from tempest.common.utils.linux import remote_client
 from tempest.common import waiters
 from tempest import config
-from tempest import exceptions
+from tempest.lib import exceptions
 from tempest import test
 
 
diff --git a/tempest/api/compute/servers/test_server_personality.py b/tempest/api/compute/servers/test_server_personality.py
index 1a5174b..ab291b4 100644
--- a/tempest/api/compute/servers/test_server_personality.py
+++ b/tempest/api/compute/servers/test_server_personality.py
@@ -118,7 +118,9 @@
             raise self.skipException("No limit for personality files")
         person = []
         for i in range(0, int(max_file_limit)):
-            path = '/etc/test' + str(i) + '.txt'
+            # NOTE(andreaf) The cirros disk image is blank before boot
+            # so we can only inject safely to /
+            path = '/test' + str(i) + '.txt'
             person.append({
                 'path': path,
                 'contents': base64.encode_as_text(file_contents + str(i)),
diff --git a/tempest/api/identity/admin/v3/test_endpoints.py b/tempest/api/identity/admin/v3/test_endpoints.py
index 50cf258..655e4ef 100644
--- a/tempest/api/identity/admin/v3/test_endpoints.py
+++ b/tempest/api/identity/admin/v3/test_endpoints.py
@@ -23,7 +23,6 @@
     @classmethod
     def setup_clients(cls):
         super(EndPointsTestJSON, cls).setup_clients()
-        cls.identity_client = cls.client
         cls.client = cls.endpoints_client
 
     @classmethod
diff --git a/tempest/api/identity/admin/v3/test_endpoints_negative.py b/tempest/api/identity/admin/v3/test_endpoints_negative.py
index b16605e..f0f8707 100644
--- a/tempest/api/identity/admin/v3/test_endpoints_negative.py
+++ b/tempest/api/identity/admin/v3/test_endpoints_negative.py
@@ -25,7 +25,6 @@
     @classmethod
     def setup_clients(cls):
         super(EndpointsNegativeTestJSON, cls).setup_clients()
-        cls.identity_client = cls.client
         cls.client = cls.endpoints_client
 
     @classmethod
diff --git a/tempest/api/image/v2/test_images_member.py b/tempest/api/image/v2/test_images_member.py
index fe8dd65..8a4b334 100644
--- a/tempest/api/image/v2/test_images_member.py
+++ b/tempest/api/image/v2/test_images_member.py
@@ -21,6 +21,8 @@
         image_id = self._create_image()
         member = self.image_member_client.create_image_member(
             image_id, member=self.alt_tenant_id)
+        self.addCleanup(self.image_member_client.delete_image_member,
+                        image_id, self.alt_tenant_id)
         self.assertEqual(member['member_id'], self.alt_tenant_id)
         self.assertEqual(member['image_id'], image_id)
         self.assertEqual(member['status'], 'pending')
@@ -42,6 +44,8 @@
         image_id = self._create_image()
         member = self.image_member_client.create_image_member(
             image_id, member=self.alt_tenant_id)
+        self.addCleanup(self.image_member_client.delete_image_member,
+                        image_id, self.alt_tenant_id)
         self.assertEqual(member['member_id'], self.alt_tenant_id)
         self.assertEqual(member['image_id'], image_id)
         self.assertEqual(member['status'], 'pending')
@@ -56,6 +60,8 @@
         image_id = self._create_image()
         self.image_member_client.create_image_member(
             image_id, member=self.alt_tenant_id)
+        self.addCleanup(self.image_member_client.delete_image_member,
+                        image_id, self.alt_tenant_id)
         self.alt_image_member_client.update_image_member(image_id,
                                                          self.alt_tenant_id,
                                                          status='accepted')
diff --git a/tempest/api/volume/test_snapshot_metadata.py b/tempest/api/volume/test_snapshot_metadata.py
index 171e241..d0fa07e 100644
--- a/tempest/api/volume/test_snapshot_metadata.py
+++ b/tempest/api/volume/test_snapshot_metadata.py
@@ -36,60 +36,47 @@
         cls.volume = cls.create_volume()
         # Create a snapshot
         cls.snapshot = cls.create_snapshot(volume_id=cls.volume['id'])
-        cls.snapshot_id = cls.snapshot['id']
 
     def tearDown(self):
         # Update the metadata to {}
         self.snapshots_client.update_snapshot_metadata(
-            self.snapshot_id, metadata={})
+            self.snapshot['id'], metadata={})
         super(SnapshotV2MetadataTestJSON, self).tearDown()
 
     @test.idempotent_id('a2f20f99-e363-4584-be97-bc33afb1a56c')
-    def test_create_get_delete_snapshot_metadata(self):
+    def test_crud_snapshot_metadata(self):
         # Create metadata for the snapshot
         metadata = {"key1": "value1",
                     "key2": "value2",
                     "key3": "value3"}
-        expected = {"key2": "value2",
-                    "key3": "value3"}
-        body = self.snapshots_client.create_snapshot_metadata(
-            self.snapshot_id, metadata)['metadata']
-        # Get the metadata of the snapshot
-        body = self.snapshots_client.show_snapshot_metadata(
-            self.snapshot_id)['metadata']
-        self.assertThat(body.items(), matchers.ContainsAll(metadata.items()))
-
-        # Delete one item metadata of the snapshot
-        self.snapshots_client.delete_snapshot_metadata_item(
-            self.snapshot_id, "key1")
-        body = self.snapshots_client.show_snapshot_metadata(
-            self.snapshot_id)['metadata']
-        self.assertThat(body.items(), matchers.ContainsAll(expected.items()))
-        self.assertNotIn("key1", body)
-
-    @test.idempotent_id('bd2363bc-de92-48a4-bc98-28943c6e4be1')
-    def test_update_snapshot_metadata(self):
-        # Update metadata for the snapshot
-        metadata = {"key1": "value1",
-                    "key2": "value2",
-                    "key3": "value3"}
         update = {"key3": "value3_update",
                   "key4": "value4"}
-        # Create metadata for the snapshot
+        expect = {"key4": "value4"}
+        # Create metadata
         body = self.snapshots_client.create_snapshot_metadata(
-            self.snapshot_id, metadata)['metadata']
-        # Get the metadata of the snapshot
-        body = self.snapshots_client.show_snapshot_metadata(
-            self.snapshot_id)['metadata']
-        self.assertThat(body.items(), matchers.ContainsAll(metadata.items()))
+            self.snapshot['id'], metadata)['metadata']
 
-        # Update metadata item
-        body = self.snapshots_client.update_snapshot_metadata(
-            self.snapshot_id, metadata=update)['metadata']
         # Get the metadata of the snapshot
         body = self.snapshots_client.show_snapshot_metadata(
-            self.snapshot_id)['metadata']
-        self.assertEqual(update, body)
+            self.snapshot['id'])['metadata']
+        self.assertThat(body.items(), matchers.ContainsAll(metadata.items()),
+                        'Create snapshot metadata failed')
+
+        # Update metadata
+        body = self.snapshots_client.update_snapshot_metadata(
+            self.snapshot['id'], metadata=update)['metadata']
+        body = self.snapshots_client.show_snapshot_metadata(
+            self.snapshot['id'])['metadata']
+        self.assertEqual(update, body, 'Update snapshot metadata failed')
+
+        # Delete one item metadata of the snapshot
+        self.snapshots_client.delete_snapshot_metadata_item(
+            self.snapshot['id'], "key3")
+        body = self.snapshots_client.show_snapshot_metadata(
+            self.snapshot['id'])['metadata']
+        self.assertThat(body.items(), matchers.ContainsAll(expect.items()),
+                        'Delete one item metadata of the snapshot failed')
+        self.assertNotIn("key3", body)
 
     @test.idempotent_id('e8ff85c5-8f97-477f-806a-3ac364a949ed')
     def test_update_snapshot_metadata_item(self):
@@ -103,17 +90,17 @@
                   "key3": "value3_update"}
         # Create metadata for the snapshot
         body = self.snapshots_client.create_snapshot_metadata(
-            self.snapshot_id, metadata)['metadata']
+            self.snapshot['id'], metadata)['metadata']
         # Get the metadata of the snapshot
         body = self.snapshots_client.show_snapshot_metadata(
-            self.snapshot_id)['metadata']
+            self.snapshot['id'])['metadata']
         self.assertThat(body.items(), matchers.ContainsAll(metadata.items()))
         # Update metadata item
         body = self.snapshots_client.update_snapshot_metadata_item(
-            self.snapshot_id, "key3", meta=update_item)['meta']
+            self.snapshot['id'], "key3", meta=update_item)['meta']
         # Get the metadata of the snapshot
         body = self.snapshots_client.show_snapshot_metadata(
-            self.snapshot_id)['metadata']
+            self.snapshot['id'])['metadata']
         self.assertThat(body.items(), matchers.ContainsAll(expect.items()))
 
 
diff --git a/tempest/api/volume/test_volume_metadata.py b/tempest/api/volume/test_volume_metadata.py
index ee1744d..c125bb8 100644
--- a/tempest/api/volume/test_volume_metadata.py
+++ b/tempest/api/volume/test_volume_metadata.py
@@ -33,52 +33,39 @@
         super(VolumesV2MetadataTest, self).tearDown()
 
     @test.idempotent_id('6f5b125b-f664-44bf-910f-751591fe5769')
-    def test_create_get_delete_volume_metadata(self):
+    def test_crud_volume_metadata(self):
         # Create metadata for the volume
         metadata = {"key1": "value1",
                     "key2": "value2",
                     "key3": "value3",
                     "key4": "<value&special_chars>"}
+        update = {"key4": "value4",
+                  "key1": "value1_update"}
+        expected = {"key4": "value4"}
 
         body = self.volumes_client.create_volume_metadata(self.volume['id'],
                                                           metadata)['metadata']
         # Get the metadata of the volume
         body = self.volumes_client.show_volume_metadata(
             self.volume['id'])['metadata']
-        self.assertThat(body.items(), matchers.ContainsAll(metadata.items()))
+        self.assertThat(body.items(), matchers.ContainsAll(metadata.items()),
+                        'Create metadata for the volume failed')
+
+        # Update metadata
+        body = self.volumes_client.update_volume_metadata(
+            self.volume['id'], update)['metadata']
+        body = self.volumes_client.show_volume_metadata(
+            self.volume['id'])['metadata']
+        self.assertEqual(update, body, 'Update metadata failed')
+
         # Delete one item metadata of the volume
         self.volumes_client.delete_volume_metadata_item(
             self.volume['id'], "key1")
         body = self.volumes_client.show_volume_metadata(
             self.volume['id'])['metadata']
         self.assertNotIn("key1", body)
-        del metadata["key1"]
-        self.assertThat(body.items(), matchers.ContainsAll(metadata.items()))
-
-    @test.idempotent_id('774d2918-9beb-4f30-b3d1-2a4e8179ec0a')
-    def test_update_volume_metadata(self):
-        # Update metadata for the volume
-        metadata = {"key1": "value1",
-                    "key2": "value2",
-                    "key3": "value3"}
-
-        update = {"key4": "value4",
-                  "key1": "value1_update"}
-
-        # Create metadata for the volume
-        body = self.volumes_client.create_volume_metadata(
-            self.volume['id'], metadata)['metadata']
-        # Get the metadata of the volume
-        body = self.volumes_client.show_volume_metadata(
-            self.volume['id'])['metadata']
-        self.assertThat(body.items(), matchers.ContainsAll(metadata.items()))
-        # Update metadata
-        body = self.volumes_client.update_volume_metadata(
-            self.volume['id'], update)['metadata']
-        # Get the metadata of the volume
-        body = self.volumes_client.show_volume_metadata(
-            self.volume['id'])['metadata']
-        self.assertEqual(update, body)
+        self.assertThat(body.items(), matchers.ContainsAll(expected.items()),
+                        'Delete one item metadata of the volume failed')
 
     @test.idempotent_id('862261c5-8df4-475a-8c21-946e50e36a20')
     def test_update_volume_metadata_item(self):
@@ -93,7 +80,8 @@
         # Create metadata for the volume
         body = self.volumes_client.create_volume_metadata(
             self.volume['id'], metadata)['metadata']
-        self.assertThat(body.items(), matchers.ContainsAll(metadata.items()))
+        self.assertThat(body.items(),
+                        matchers.ContainsAll(metadata.items()))
         # Update metadata item
         body = self.volumes_client.update_volume_metadata_item(
             self.volume['id'], "key3", update_item)['meta']
diff --git a/tempest/common/compute.py b/tempest/common/compute.py
index 318eb10..64543fb 100644
--- a/tempest/common/compute.py
+++ b/tempest/common/compute.py
@@ -169,27 +169,28 @@
     return body, servers
 
 
-def shelve_server(client, server_id, force_shelve_offload=False):
+def shelve_server(servers_client, server_id, force_shelve_offload=False):
     """Common wrapper utility to shelve server.
 
     This method is a common wrapper to make server in 'SHELVED'
     or 'SHELVED_OFFLOADED' state.
 
+    :param servers_clients: Compute servers client instance.
     :param server_id: Server to make in shelve state
     :param force_shelve_offload: Forcefully offload shelve server if it
                                  is configured not to offload server
                                  automatically after offload time.
     """
-    client.shelve_server(server_id)
+    servers_client.shelve_server(server_id)
 
     offload_time = CONF.compute.shelved_offload_time
     if offload_time >= 0:
-        waiters.wait_for_server_status(client, server_id,
+        waiters.wait_for_server_status(servers_client, server_id,
                                        'SHELVED_OFFLOADED',
                                        extra_timeout=offload_time)
     else:
-        waiters.wait_for_server_status(client, server_id, 'SHELVED')
+        waiters.wait_for_server_status(servers_client, server_id, 'SHELVED')
         if force_shelve_offload:
-            client.shelve_offload_server(server_id)
-            waiters.wait_for_server_status(client, server_id,
+            servers_client.shelve_offload_server(server_id)
+            waiters.wait_for_server_status(servers_client, server_id,
                                            'SHELVED_OFFLOADED')
diff --git a/tempest/scenario/test_minimum_basic.py b/tempest/scenario/test_minimum_basic.py
index 3ac6759..f2f17d2 100644
--- a/tempest/scenario/test_minimum_basic.py
+++ b/tempest/scenario/test_minimum_basic.py
@@ -16,8 +16,8 @@
 from tempest.common import custom_matchers
 from tempest.common import waiters
 from tempest import config
-from tempest import exceptions
 from tempest.lib.common.utils import test_utils
+from tempest.lib import exceptions
 from tempest.scenario import manager
 from tempest import test
 
diff --git a/tempest/scenario/test_server_basic_ops.py b/tempest/scenario/test_server_basic_ops.py
index 3aab2b8..2d2f7df 100644
--- a/tempest/scenario/test_server_basic_ops.py
+++ b/tempest/scenario/test_server_basic_ops.py
@@ -18,8 +18,8 @@
 
 from tempest.common import waiters
 from tempest import config
-from tempest import exceptions
 from tempest.lib.common.utils import test_utils
+from tempest.lib import exceptions
 from tempest.scenario import manager
 from tempest import test