Add missing sadis config for TT workflow and openonu-py adapter

Change-Id: I4e6e4dcaabb6b97384b17ee26672ae49b279088d
diff --git a/.gitreview b/.gitreview
index 4e39788..bd95b9f 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=voltha-system-tests.git
 defaultremote=origin
+defaultbranch=voltha-2.6