Upgrade BAL version to 3.4.7.5
Fix watchdog script - fetch vlan-ids from the config file before trying to reference it
Release 2.5.1

Change-Id: I5e131c7d247cca0512ff94c57343a9a89297cf5d
diff --git a/.gitreview b/.gitreview
index 84dc7a2..84a1a00 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=openolt.git
 defaultremote=origin
+defaultbranch=voltha-2.5