CORD-2772 set version number for onos service

Change-Id: I801262dbb49fca5eb3855d6486a21340428cd15e
diff --git a/xos/synchronizer/Dockerfile.synchronizer b/xos/synchronizer/Dockerfile.synchronizer
index 695b283..ed99ac6 100644
--- a/xos/synchronizer/Dockerfile.synchronizer
+++ b/xos/synchronizer/Dockerfile.synchronizer
@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# This Dockerfile is DEPRECATED and will be removed imminently.
 
 # xosproject/onos-synchronizer
 FROM xosproject/xos-synchronizer-base:candidate