Modify gitreview file

Change-Id: I0ed70bbecc89d151383b18b8703e586009b7e07b
diff --git a/.gitreview b/.gitreview
index 4bfe46f..693f7df 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=cord-tester.git
 defaultremote=origin
+defaultbranch=cord-6.0