Watch for changes in Node objects

Change-Id: If01962e18763c67be06d955fac25b4656e3479f4
diff --git a/xos/synchronizer/vtn_synchronizer_config b/xos/synchronizer/vtn_synchronizer_config
index d931839..9c99456 100644
--- a/xos/synchronizer/vtn_synchronizer_config
+++ b/xos/synchronizer/vtn_synchronizer_config
@@ -32,6 +32,7 @@
 driver=openstack
 pretend=False
 backoff_disabled=True
+enable_watchers=True
 
 [nova]
 ca_ssl_cert=/etc/ssl/certs/ca-certificates.crt