Updating .gitreview for 1.3 support branch

Change-Id: I154a2dacaeadcd570e0a299bc8c359bb4f465b8f
diff --git a/.gitreview b/.gitreview
index 328aec6..1b56e0a 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=onos.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=onos-1.3