CORD-1010 refactor openstack synchronizer to use new_base

Change-Id: I4eb4e5131275faf69e1da05efc81a3d8d0d12296
diff --git a/xos/synchronizer/steps/purge_disabled_users.py b/xos/synchronizer/steps/purge_disabled_users.py
index 5cb7b06..425d4e4 100644
--- a/xos/synchronizer/steps/purge_disabled_users.py
+++ b/xos/synchronizer/steps/purge_disabled_users.py
@@ -1,11 +1,10 @@
 import os
 import base64
 import datetime
-from django.db.models import F, Q
 from xos.config import Config
 from synchronizers.openstack.openstacksyncstep import OpenStackSyncStep
-from core.models.user import User
 from xos.logger import observer_logger as logger
+from synchronizers.new_base.modelaccessor import *
 
 #class SyncRoles(OpenStackSyncStep):
 #    provides=[User]