CORD-879 eliminate proxy models in vtr service

Change-Id: Iab26025c87b18c26c83b5857138a17fc3b04b10d
diff --git a/xos/tosca/resources/vtrservice.py b/xos/tosca/resources/vtrservice.py
new file mode 100644
index 0000000..352796e
--- /dev/null
+++ b/xos/tosca/resources/vtrservice.py
@@ -0,0 +1,9 @@
+from xosresource import XOSResource
+from service import XOSService
+from core.models import Service, User, CoarseTenant
+from services.vtr.models import VTRService
+
+class XOSVTRService(XOSService):
+    provides = "tosca.nodes.VTRService"
+    xos_model = VTRService
+