CORD-1010 refactor openstack synchronizer to use new_base

Change-Id: I4eb4e5131275faf69e1da05efc81a3d8d0d12296
diff --git a/xos/synchronizer/steps/sync_roles.py b/xos/synchronizer/steps/sync_roles.py
index 418b4ea..c202f74 100644
--- a/xos/synchronizer/steps/sync_roles.py
+++ b/xos/synchronizer/steps/sync_roles.py
@@ -1,12 +1,9 @@
 import os
 import base64
-from django.db.models import F, Q
 from xos.config import Config
 from synchronizers.openstack.openstacksyncstep import OpenStackSyncStep
-from core.models.role import Role
-from core.models.site import SiteRole, Controller, ControllerRole
-from core.models.slice import SliceRole
 from xos.logger import observer_logger as logger
+from synchronizers.new_base.modelaccessor import *
 
 class SyncRoles(OpenStackSyncStep):
     provides=[Role]