bump to 1.12 branch

Change-Id: I5c58915ecaf2fbaaa364de244170940f2cced5e9
diff --git a/.gitreview b/.gitreview
index 328aec6..cca535f 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=onos.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=onos-1.12