[VOL-5064] Release patch repo:voltha-system-tests (branch=master)

VERSION
.gitreview
----------
 o Post release tag & branch patch for branch=master.
 o Bump version string to avoid conflicts:
   - branch=master  (X.{1+Y}.0)
   - branch=release (X.Y.{1+Z})
 o Update .gitreview (defaultpath=master), specify rebase/merge target.

Change-Id: I7a7c4982d0bca6b3771142e45779e78bac69f495
diff --git a/VERSION b/VERSION
index d94526e..f92b44a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.12.11
+2.13.0-dev