CORD-1250 Update to new Service/Tenancy models

Change-Id: Ie98caa95aed385413f9f28668fe3f3d5f4eab9e9
diff --git a/xos/attic/vtrtenant_model.py b/xos/attic/vtrtenant_model.py
index f2d24c3..2bd55cb 100644
--- a/xos/attic/vtrtenant_model.py
+++ b/xos/attic/vtrtenant_model.py
@@ -3,7 +3,7 @@
 def __init__(self, *args, **kwargs):
     vtr_services = VTRService.objects.all()
     if vtr_services:
-        self._meta.get_field("provider_service").default = vtr_services[0].id
+        self._meta.get_field("owner").default = vtr_services[0].id
     super(VTRTenant, self).__init__(*args, **kwargs)
 
 def save(self, *args, **kwargs):