CORD-879 fix admin UI issues related to proxy cleanup; fix unable to delete cordsubscriberroot

Change-Id: I93ba8bdbb1b64067a28f6771213b4895863abd08
diff --git a/xos/models.py b/xos/models.py
index 0db165d..cf3c59b 100644
--- a/xos/models.py
+++ b/xos/models.py
@@ -1,5 +1,5 @@
 from django.db import models
-from core.models import Service, PlCoreBase, Slice, Instance, Tenant, TenantWithContainer, Node, Image, User, Flavor, Subscriber, NetworkParameter, NetworkParameterType, Port, AddressPool, User
+from core.models import Service, PlCoreBase, Slice, Instance, Tenant, TenantWithContainer, Node, Image, User, Flavor, TenantRoot, NetworkParameter, NetworkParameterType, Port, AddressPool, User
 from core.models.plcorebase import StrippedCharField
 import os
 from django.db import models, transaction
@@ -25,7 +25,7 @@
 # CordSubscriberRoot
 # -------------------------------------------
 
-class CordSubscriberRoot(Subscriber):
+class CordSubscriberRoot(TenantRoot):
     class Meta:
         app_label = "volt"