Code Sync from neutron project to newly created neutron-tempest-plugin

* The following commit sync the code from following hash:
  start_hash: 7279aa35851110a4933a10b58b2758a2bc3933a3
  end_hash: 6e911a49a9e630878f4c46f61fde3964be550880

Change-Id: I371aa4d5f043f695df04b98b0f485c8f0548f2b3
diff --git a/neutron_tempest_plugin/api/test_extensions.py b/neutron_tempest_plugin/api/test_extensions.py
index 4659ba9..1462ae1 100644
--- a/neutron_tempest_plugin/api/test_extensions.py
+++ b/neutron_tempest_plugin/api/test_extensions.py
@@ -10,8 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from tempest.common import utils
 from tempest.lib import decorators
-from tempest import test
 
 from neutron_tempest_plugin.api import base
 
@@ -22,7 +22,7 @@
         body = self.client.list_extensions()
         extensions = {ext_['alias'] for ext_ in body['extensions']}
         self.assertNotEmpty(extensions, "Extension list returned is empty")
-        ext_enabled = test.is_extension_enabled(ext, "network")
+        ext_enabled = utils.is_extension_enabled(ext, "network")
         if ext_enabled:
             self.assertIn(ext, extensions)
         else: