Using onos-2.2 as base for ONOS VOLTHA

Change-Id: Ief5628793ec5e6693504232b7a1464506b67ce59
diff --git a/VERSION b/VERSION
index c043eea..d9b058f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.1
+4.0.0-dev