Releasing with ONOS ports fix and OLT port disable

Change-Id: Ib4829b475f4e2298b1da3a52f4d4037c17403a8a
diff --git a/VERSION b/VERSION
index 4ed678a..1e796af 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.1.0-dev12
+5.1.0-dev13