drop support for V1 VTN API

Change-Id: I87e91785edc7890aeda6c078a80c6c05ab6af66b
diff --git a/xos/synchronizer/steps/sync_vtn_service.py b/xos/synchronizer/steps/sync_vtn_service.py
index 112fc5a..97f0db6 100644
--- a/xos/synchronizer/steps/sync_vtn_service.py
+++ b/xos/synchronizer/steps/sync_vtn_service.py
@@ -221,6 +221,7 @@
         else:
             # default to legacy
             logger.info("Using Old API")
-            self.sync_legacy_vtn_api()
+            raise Exception("VTN API Version 1 is no longer supported by VTN Synchronizer")
+            #self.sync_legacy_vtn_api()