CORD-1244 Modify model_policies for OpenStack synchronizer

Change-Id: I8e946e3ca665689bd0449b80d87fe4bb29afde99
diff --git a/xos/synchronizer/model_policies/model_policy_SitePrivilege.py b/xos/synchronizer/model_policies/model_policy_SitePrivilege.py
index 2218994..10600fb 100644
--- a/xos/synchronizer/model_policies/model_policy_SitePrivilege.py
+++ b/xos/synchronizer/model_policies/model_policy_SitePrivilege.py
@@ -1,15 +1,22 @@
 from synchronizers.new_base.modelaccessor import *
+from synchronizers.new_base.policy import Policy
 
-def handle(site_privilege):
-    # site_privilege = SitePrivilege.get(site_privilege_id)
-    # apply site privilage at all controllers
-    controller_site_privileges = ControllerSitePrivilege.objects.filter(
-        site_privilege_id = site_privilege.id,
-        )
-    existing_controllers = [sp.controller for sp in controller_site_privileges]
-    all_controllers = Controller.objects.all()
-    for controller in all_controllers:
-        if controller not in existing_controllers:
-            ctrl_site_priv = ControllerSitePrivilege(controller=controller, site_privilege=site_privilege)
-            ctrl_site_priv.save()  
+class SitePrivilegePolicy(Policy):
+    model_name = "SitePrivilege"
+
+    def handle_create(self, site_privilege):
+        return self.handle_update(site_privilege)
+
+    def handle_update(self, site_privilege):
+        # site_privilege = SitePrivilege.get(site_privilege_id)
+        # apply site privilage at all controllers
+        controller_site_privileges = ControllerSitePrivilege.objects.filter(
+            site_privilege_id = site_privilege.id,
+            )
+        existing_controllers = [sp.controller for sp in controller_site_privileges]
+        all_controllers = Controller.objects.all()
+        for controller in all_controllers:
+            if controller not in existing_controllers:
+                ctrl_site_priv = ControllerSitePrivilege(controller=controller, site_privilege=site_privilege)
+                ctrl_site_priv.save()