Revert to dev version

Change-Id: I1c435a080ef814e2a458dd8c413e97fbcf0b36c9
diff --git a/VERSION b/VERSION
index 5bd8c54..2653fe5 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.15
+2.2.16-dev