[VOL-5031] Build and deploy voltha-onos for v2.12

makefiles/*
-----------
  o https://github.com/opencord/onf-make
  o Update to the latest library makefiles to support more lint targets.

VERSION
-------
  o Cosmetic dev version bump to triage build state.

Change-Id: Iaddd825c24afdfa13e99cfd46cfe887072016d0f
diff --git a/VERSION b/VERSION
index 4de34c3..b21411a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.1.4-dev
+5.1.5-dev