Post release increment to version 2.1.2-dev

Change-Id: I1d221cc2d8f33bc830af2feea5d2fb117dd26626
diff --git a/VERSION b/VERSION
index 3e3c2f1..7f8d85c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.1
+2.1.2-dev