Updating .gitreview for support branch

Change-Id: I76a4e75856d1c4a7f90541613761a22a1c620211
diff --git a/.gitreview b/.gitreview
index 328aec6..0e1ecf5 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=onos.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=onos-1.2