bumping to version 1.15

Change-Id: Ifd0e9ee742ef87a28dc1b1fefc0c72e2acf6cd64
diff --git a/.gitreview b/.gitreview
index 328aec6..df45dd8 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=onos.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=onos-1.15