VOL-2030 Release 2.1 branch voltha-openolt-adapter version 2.1.2

Change-Id: Ic45ef96244fda0333f84e7e28672547efae90540
diff --git a/VERSION b/VERSION
index 7f8d85c..eca07e4 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.2-dev
+2.1.2