bump to use dev branch

Change-Id: Ie123421543af2abe2c54abeb03f379371006d626
diff --git a/.gitreview b/.gitreview
index 328aec6..b86ceb3 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=onos.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=dev-karaf-4.2.1