CORD-1244 cleanup use of get_tenant/get_service

Change-Id: I89474025859ad0d0faf148b5c25706035908c71f
diff --git a/xos/attic/onosapp_model.py b/xos/attic/onosapp_model.py
index 5366952..a294f2d 100644
--- a/xos/attic/onosapp_model.py
+++ b/xos/attic/onosapp_model.py
@@ -1,5 +1,5 @@
 def __init__(self, *args, **kwargs):
-    onos_services = ONOSService.get_service_objects().all()
+    onos_services = ONOSService.objects.all()
     if onos_services:
         self._meta.get_field("provider_service").default = onos_services[0].id
     super(ONOSApp, self).__init__(*args, **kwargs)