drop support for V1 VTN API

Change-Id: I87e91785edc7890aeda6c078a80c6c05ab6af66b
diff --git a/xos/synchronizer/vtn-synchronizer.py b/xos/synchronizer/vtn-synchronizer.py
index 3c99763..e162e18 100755
--- a/xos/synchronizer/vtn-synchronizer.py
+++ b/xos/synchronizer/vtn-synchronizer.py
@@ -9,11 +9,13 @@
 
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "xos.settings")
 
-import synchronizers.base.event_loop
-if hasattr(synchronizers.base.event_loop, "set_driver"):
-    # VTN synchronizer needs the OpenStack driver
-    from openstack_xos.driver import OpenStackDriver
-    synchronizers.base.event_loop.set_driver(OpenStackDriver())
+# Legacy code to support VTN API version 1.
+
+# import synchronizers.base.event_loop
+# if hasattr(synchronizers.base.event_loop, "set_driver"):
+#    # VTN synchronizer needs the OpenStack driver
+#    from openstack_xos.driver import OpenStackDriver
+#    synchronizers.base.event_loop.set_driver(OpenStackDriver())
 
 mod = importlib.import_module("synchronizers.base.xos-synchronizer")
 mod.main()