SEBA-497 delayering, Makefile, and tox for volt-synchronizer

Change-Id: I68125659442e9d53720f7f327f66f335b97d5b5a
diff --git a/VERSION b/VERSION
index fba128e..ccbccc3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.24-dev
+2.2.0