Starting snapshot 3.1.0-SNAPSHOT

Also fixing remote on .gitreview

Change-Id: I8854545af5607ab475d0a8fd304b21bb9915b61d
diff --git a/.gitreview b/.gitreview
index d8fe155..139630d 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=olt.git
 defaultremote=origin
-defaultbranch=voltha-1.7
+defaultbranch=olt-3.0