[CORD-2938] Moving convenience methods in the synchronizer containers

Change-Id: I2c777ddad38659e96cb37521a346830735e0e483
diff --git a/xos/synchronizer/models/convenience/vtrtenant.py b/xos/synchronizer/models/convenience/vtrtenant.py
new file mode 100644
index 0000000..ddc64ae
--- /dev/null
+++ b/xos/synchronizer/models/convenience/vtrtenant.py
@@ -0,0 +1,23 @@
+
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from xosapi.orm import ORMWrapper, register_convenience_wrapper
+
+class ORMWrapperVTRTenant(ORMWrapper):
+    def get_generic_foreignkeys(self):
+        return [{"name": "target", "content_type": "target_type", "id": "target_id"}]
+
+register_convenience_wrapper("VTRTenant", ORMWrapperVTRTenant)