CORD-1008 Dockerfile and docker-compose for vtn synchronizer

Change-Id: Ia6624c199624fcb9d497da1326220353c5d2614b
diff --git a/xos/synchronizer/steps/sync_port_addresses.py b/xos/synchronizer/steps/sync_port_addresses.py
index 57de70b..029755b 100644
--- a/xos/synchronizer/steps/sync_port_addresses.py
+++ b/xos/synchronizer/steps/sync_port_addresses.py
@@ -10,6 +10,8 @@
 
 logger = Logger(level=logging.INFO)
 
+# TODO: This file seems obsolete -- evaluate for deletion.
+
 # XXX should save and load this
 glo_saved_vtn_maps = []