CORD-1010 refactor openstack synchronizer to use new_base

Change-Id: I4eb4e5131275faf69e1da05efc81a3d8d0d12296
diff --git a/xos/synchronizer/model_policies/model_policy_ControllerSlice.py b/xos/synchronizer/model_policies/model_policy_ControllerSlice.py
index bfe7995..3c6d54f 100644
--- a/xos/synchronizer/model_policies/model_policy_ControllerSlice.py
+++ b/xos/synchronizer/model_policies/model_policy_ControllerSlice.py
@@ -1,6 +1,6 @@
+from synchronizers.new_base.modelaccessor import *
+
 def handle(controller_slice):
-    from core.models import ControllerSlice, Slice
-   
     try:
         my_status_code = int(controller_slice.backend_status[0])
         try: