CORD-1010 Fix Controller, Image, Network, and User model_policies

Change-Id: I42f8771048090666acd9d75ca32b6081a72ce880
diff --git a/xos/synchronizer/model_policies/model_policy_Instance.py b/xos/synchronizer/model_policies/model_policy_Instance.py
index c810a96..db07cf6 100644
--- a/xos/synchronizer/model_policies/model_policy_Instance.py
+++ b/xos/synchronizer/model_policies/model_policy_Instance.py
@@ -41,8 +41,8 @@
                 print "MODEL POLICY: instance", instance, "created port", port
 
 def handle(instance):
-    networks = [ns.network for ns in NetworkSlice.objects.filter(slice=instance.slice)]
-    controller_networks = ControllerNetwork.objects.filter(controller=instance.node.site_deployment.controller)
+    networks = [ns.network for ns in NetworkSlice.objects.filter(slice_id=instance.slice.id)]
+    controller_networks = ControllerNetwork.objects.filter(controller_id=instance.node.site_deployment.controller.id)
 
     # a little clumsy because the API ORM doesn't support __in queries
     network_ids = [x.id for x in networks]