Add ObjectRetrier to CinderaBackupTests

This adds the auto-retrier to the cinder client to get past race hazards
and other transient errors.

zaza/openstack/charm_tests/cinder_backup/tests.py

@@ -22,6 +22,7 @@
 
 import zaza.model
 import zaza.openstack.charm_tests.test_utils as test_utils
+from zaza.openstack.utilities import ObjectRetrierWraps
 import zaza.openstack.utilities.ceph as ceph_utils
 import zaza.openstack.utilities.openstack as openstack_utils
 
@@ -35,8 +36,8 @@ class CinderBackupTest(test_utils.OpenStackBaseTest):
     def setUpClass(cls):
         """Run class setup for running Cinder Backup tests."""
         super(CinderBackupTest, cls).setUpClass()
-        cls.cinder_client = openstack_utils.get_cinder_session_client(
-            cls.keystone_session)
+        cls.cinder_client = ObjectRetrierWraps(
+            openstack_utils.get_cinder_session_client(cls.keystone_session))
 
     @property
     def services(self):