VOL-5137 - Create beta-release branch for voltha-system-tests

VERSION
-------
  o Bump version string and attach suffix *-dev for the post release branch.

Change-Id: I308195689304e315570404b7571c2bd9e218dff9
diff --git a/VERSION b/VERSION
index fb4fcb1..1717218 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.12.7.1-dev1
+2.12.9-dev