Update .gitreview default branch

Change-Id: Iafe74989ca810dadd834910f9b193f00f58b339b
diff --git a/.gitreview b/.gitreview
index d404b06..e306b0d 100644
--- a/.gitreview
+++ b/.gitreview
@@ -2,4 +2,4 @@
 host=gerrit.onos.onlab.us
 port=29418
 project=ONOS.git
-defaultbranch=dev/ramcloud
+defaultbranch=dev/ramcloud-new-datamodel