check VTN API version in sync_port_addresses

Change-Id: Ib829b037e0cbb7695ab2c7a8dc3a3463ef584540
diff --git a/xos/synchronizer/steps/sync_vtn_service.py b/xos/synchronizer/steps/sync_vtn_service.py
index a4016e5..7bdee17 100644
--- a/xos/synchronizer/steps/sync_vtn_service.py
+++ b/xos/synchronizer/steps/sync_vtn_service.py
@@ -205,7 +205,7 @@
 
         vtn_service = vtn_service[0]
 
-        if vtn_service.vtnAPIVersion==2:
+        if vtn_service.vtnAPIVersion>=2:
             # version 2 means use new API
             logger.info("Using New API")
             self.sync_service_networks()