[VOL-4371] Voltha protos cleanup

Change-Id: I5ea4319fd643551c68bd80521c84b69206bbedfd
diff --git a/VERSION b/VERSION
index f8a696c..661e7ae 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.7.2
+1.7.3