Moving to candidate for docker image

Change-Id: If2ab86673ca7825dcdc348272bd0dee967310ceb
diff --git a/xos/synchronizer/Dockerfile.synchronizer b/xos/synchronizer/Dockerfile.synchronizer
index c1a6a6b..d0783c0 100644
--- a/xos/synchronizer/Dockerfile.synchronizer
+++ b/xos/synchronizer/Dockerfile.synchronizer
@@ -1,4 +1,4 @@
-FROM xosproject/xos-synchronizer-base
+FROM xosproject/xos-synchronizer-base:candidate
 
 ADD . /opt/xos/synchronizers/veg