CORD-1057 remove VTR service reference to CoarseTenant

Change-Id: I4d005642dc7dc1025207ef92da7c44b58a610cf6
diff --git a/xos/tosca/resources/vtrservice.py b/xos/tosca/resources/vtrservice.py
index 352796e..d60116a 100644
--- a/xos/tosca/resources/vtrservice.py
+++ b/xos/tosca/resources/vtrservice.py
@@ -1,6 +1,5 @@
 from xosresource import XOSResource
 from service import XOSService
-from core.models import Service, User, CoarseTenant
 from services.vtr.models import VTRService
 
 class XOSVTRService(XOSService):