Add functional testing for the v2 API quotas endpoint

This is disabled by default, I7a0b828824ad6f274d922748f5f9a68157cd939a
will enable it.

Change-Id: I06180a7402fc45940d4b312666cf2dfd33af1305
diff --git a/designate_tempest_plugin/tests/base.py b/designate_tempest_plugin/tests/base.py
index 9f24d62..c86b38a 100644
--- a/designate_tempest_plugin/tests/base.py
+++ b/designate_tempest_plugin/tests/base.py
@@ -85,8 +85,8 @@
 class BaseDnsAdminTest(BaseDnsTest):
     """Base class for DNS Admin API tests."""
 
-    # Use the Designate V2 Client Manager
-    client_manager = clients.ManagerV2
+    # Use the Designate Admin Client Manager
+    client_manager = clients.ManagerAdmin
 
     @classmethod
     def skip_checks(cls):