remove some unused code in nova image tests

this removes some unused alt_client and images_id in the nova image
tests.

Change-Id: Ied9f098be9bbbc845ad07a40bfedf2dab9b9eceb
diff --git a/tempest/api/compute/v3/images/test_images.py b/tempest/api/compute/v3/images/test_images.py
index bbb84fb..b045630 100644
--- a/tempest/api/compute/v3/images/test_images.py
+++ b/tempest/api/compute/v3/images/test_images.py
@@ -13,11 +13,10 @@
 #    under the License.
 
 from tempest.api.compute import base
-from tempest import clients
 from tempest.common.utils import data_utils
 from tempest import config
 from tempest import exceptions
-from tempest.test import attr
+from tempest import test
 
 CONF = config.CONF
 
@@ -34,18 +33,6 @@
         cls.client = cls.images_client
         cls.servers_client = cls.servers_client
 
-        if cls.multi_user:
-            if CONF.compute.allow_tenant_isolation:
-                creds = cls.isolated_creds.get_alt_creds()
-                username, tenant_name, password = creds
-                cls.alt_manager = clients.Manager(username=username,
-                                                  password=password,
-                                                  tenant_name=tenant_name)
-            else:
-                # Use the alt_XXX credentials in the config file
-                cls.alt_manager = clients.AltManager()
-            cls.alt_client = cls.alt_manager.images_client
-
     def __create_image__(self, server_id, name, meta=None):
         resp, body = self.servers_client.create_image(server_id, name, meta)
         image_id = data_utils.parse_image_id(resp['location'])
@@ -53,7 +40,7 @@
         self.client.wait_for_image_status(image_id, 'ACTIVE')
         return resp, body
 
-    @attr(type=['negative', 'gate'])
+    @test.attr(type=['negative', 'gate'])
     def test_create_image_from_deleted_server(self):
         # An image should not be created if the server instance is removed
         resp, server = self.create_test_server(wait_until='ACTIVE')
@@ -68,7 +55,7 @@
                           self.__create_image__,
                           server['id'], name, meta)
 
-    @attr(type=['negative', 'gate'])
+    @test.attr(type=['negative', 'gate'])
     def test_create_image_from_invalid_server(self):
         # An image should not be created with invalid server id
         # Create a new image with invalid server id
@@ -79,7 +66,7 @@
         self.assertRaises(exceptions.NotFound, self.__create_image__,
                           '!@#$%^&*()', name, meta)
 
-    @attr(type=['negative', 'gate'])
+    @test.attr(type=['negative', 'gate'])
     def test_create_image_from_stopped_server(self):
         resp, server = self.create_test_server(wait_until='ACTIVE')
         self.servers_client.stop(server['id'])
@@ -93,7 +80,7 @@
         self.addCleanup(self.client.delete_image, image['id'])
         self.assertEqual(snapshot_name, image['name'])
 
-    @attr(type='gate')
+    @test.attr(type='gate')
     def test_delete_queued_image(self):
         snapshot_name = data_utils.rand_name('test-snap-')
         resp, server = self.create_test_server(wait_until='ACTIVE')
@@ -104,7 +91,7 @@
         resp, body = self.client.delete_image(image['id'])
         self.assertEqual('200', resp['status'])
 
-    @attr(type=['negative', 'gate'])
+    @test.attr(type=['negative', 'gate'])
     def test_create_image_specify_uuid_35_characters_or_less(self):
         # Return an error if Image ID passed is 35 characters or less
         snapshot_name = data_utils.rand_name('test-snap-')
@@ -113,7 +100,7 @@
                           self.servers_client.create_image,
                           test_uuid, snapshot_name)
 
-    @attr(type=['negative', 'gate'])
+    @test.attr(type=['negative', 'gate'])
     def test_create_image_specify_uuid_37_characters_or_more(self):
         # Return an error if Image ID passed is 37 characters or more
         snapshot_name = data_utils.rand_name('test-snap-')