Set default branch to feature/zuulv3

Change-Id: Ib82170d59c5ba3366a9cf624733f9f383e76b859
diff --git a/.gitreview b/.gitreview
index 665adb6..9ba1bdc 100644
--- a/.gitreview
+++ b/.gitreview
@@ -2,3 +2,4 @@
 host=review.openstack.org
 port=29418
 project=openstack-infra/zuul.git
+defaultbranch=feature/zuulv3