VOL-3248 Support for SetExtValue API

         This commits adds a new SetExtValue API in the VOLTHA
         core and also the handling of the request.

Change-Id: I45b76e4bcc3234842c8404514f5220573ac33211
diff --git a/VERSION b/VERSION
index 8f87ff7..e70b452 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.6.0-dev
+2.6.0