refactor vSGW cord-3.0

Change-Id: I72a19da1803d8e9dd9d7c9e848011aa28ef4d619
diff --git a/xos/tosca/resources/vsgwtenant.py b/xos/tosca/resources/vsgwtenant.py
index 48984fe..5f6c3bb 100644
--- a/xos/tosca/resources/vsgwtenant.py
+++ b/xos/tosca/resources/vsgwtenant.py
@@ -1,20 +1,20 @@
-# from services.vsgw.models import *
-from synchronizers.new_base.modelaccessor import *
 from xosresource import XOSResource
+from core.models import Service, Tenant
+from services.vsgw.models import VSGWTenant
 
 class XOSVSGWTenant(XOSResource):
     provides = "tosca.nodes.VSGWTenant"
     xos_model = VSGWTenant
     name_field = "service_specific_id"
-    copyin_props = ("tenant_message", "image_name")
+    copyin_props = ("tenant_message",)
 
     def get_xos_args(self, throw_exception=True):
         args = super(XOSVSGWTenant, self).get_xos_args()
 
         # ExampleTenant must always have a provider_service
-        provider_name = self.get_requirement("tosca.relationships.MemberOfService", throw_exception=throw_exception)
+        provider_name = self.get_requirement("tosca.relationships.TenantOfService", throw_exception=throw_exception)
         if provider_name:
-            args["provider_service"] = self.get_xos_object(VSGWService, throw_exception=throw_exception, name=provider_name)
+            args["provider_service"] = self.get_xos_object(Service, throw_exception=throw_exception, name=provider_name)
 
         return args