Creating onos-1.4 support branch

- Starting snapshot 1.4.1-SNAPSHOT
- Updating .gitreview
- Updating Dockerfile

Change-Id: I4f0dafe89e77831b34107f472647424664206195
diff --git a/.gitreview b/.gitreview
index 328aec6..53f4a97 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=onos.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=onos-1.4