VOL-4268: Migration to BAL3.4.9.9 for voltha master and 2.8 branch

Change-Id: I66c77149524f2592fb018a3bc00dc9c8a8f94153
diff --git a/VERSION b/VERSION
index c1aee2f..d5c0c99 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.5.1-dev
+3.5.1