CORD-1010 refactor openstack synchronizer to use new_base

Change-Id: I4eb4e5131275faf69e1da05efc81a3d8d0d12296
diff --git a/xos/synchronizer/model_policies/model_policy_Site.py b/xos/synchronizer/model_policies/model_policy_Site.py
index 23010a2..f800092 100644
--- a/xos/synchronizer/model_policies/model_policy_Site.py
+++ b/xos/synchronizer/model_policies/model_policy_Site.py
@@ -1,10 +1,9 @@
+from synchronizers.new_base.modelaccessor import *
 
 def handle(site):
-    from core.models import Controller, ControllerSite, Site 
-
     # site = Site.get(site_id)
     # make sure site has a ControllerSite record for each controller
-    ctrl_sites = ControllerSite.objects.filter(site=site)
+    ctrl_sites = ControllerSite.objects.filter(site_id=site.id)
     existing_controllers = [cs.controller for cs in ctrl_sites]
 
     all_controllers = Controller.objects.all()