[VOL-4371]  Voltha protos cleanup

Details can be found at:
https://docs.google.com/document/d/1UzfuiPzxYYTULyERk8nKfgzW9QAnwEdtfw_J4UoFyYo/edit

Change-Id: Iad2efddf306234e282af5d518fd435a6b50b1c41
diff --git a/VERSION b/VERSION
index a1ef0ca..831446c 100755
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.0.2
+5.1.0