Update .gitreview for release, default branch=voltha-2.11

Change-Id: Ia99a07195efed22bf0b194e1f0df85f5ac4bda0e
diff --git a/.gitreview b/.gitreview
index 4e39788..77f7f21 100644
--- a/.gitreview
+++ b/.gitreview
@@ -2,4 +2,4 @@
 host=gerrit.opencord.org
 port=29418
 project=voltha-system-tests.git
-defaultremote=origin
+defaultbranch=voltha-2.11