bumping to version 2.5

Change-Id: I10c2968b88c7d42bcec28c2e74945fc82929a98d
diff --git a/.gitreview b/.gitreview
index 328aec6..2fa2f86 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=onos.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=onos-2.5