[VOL-2842] Changes to pipeline to accommodate release branch

Change-Id: Ia4de5c93b6fb2a8407b24a08a89c91638aac66dc
diff --git a/.gitreview b/.gitreview
index 4e39788..3408abb 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=voltha-system-tests.git
 defaultremote=origin
+defaultbranch=voltha-2.3