Using the latest released app for ONOS 1.13.9

Change-Id: Ib7fe983a267480c23545873058b656c0d4bdc9fe
diff --git a/VERSION b/VERSION
index 84e6d84..c043eea 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.1-dev
+2.2.1