Do not disable ONU as result of an onu.disabled event,
save the subscriber from dhcp only if something has changed.

Change-Id: I4a97bb7fe2e08e408341aa36617709b554e9e5bb
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 28ab55e..d9c1c4e 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -16,7 +16,7 @@
 
 # xosproject/att-workflow-driver-synchronizer
 
-FROM xosproject/xos-synchronizer-base:master
+FROM xosproject/xos-synchronizer-base:2.1.4
 
 COPY xos/synchronizer /opt/xos/synchronizers/att-workflow-driver
 COPY VERSION /opt/xos/synchronizers/att-workflow-driver/