Update gitreview for v2.11, merge with branch=voltha-2.11 by default

Change-Id: Iad61c912e530ccd2eb86e1051981b43b70287841
diff --git a/.gitreview b/.gitreview
index c44e0f2..f0e6cf8 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=kafka-onos.git
 defaultremote=origin
+defaultbranch=voltha-2.11