Creating tag for voltha-2.5

Change-Id: Id0f0fbfb62fe94b4259db0777a9922fbf3f8c466
diff --git a/VERSION b/VERSION
index 499bd1e..f225a78 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.5.2-dev
+2.5.2