[VOL-5020] Release patch repo:ci-management (branch=voltha-2.12)

VOL-5020

VERSION
.gitreview
----------
 o Post release tag & branch patch for branch=voltha-2.12.
 o Bump version string to avoid conflicts:
   - branch=master  (X.{1+Y}.0)
   - branch=release (X.Y.{1+Z})
 o Update .gitreview (defaultpath=voltha-2.12), specify rebase/merge target.

Change-Id: Ie7cceabca2f9f92ea8be3a072cf0020429ddf6de
diff --git a/.gitreview b/.gitreview
index 923de6d..cfc5feb 100644
--- a/.gitreview
+++ b/.gitreview
@@ -2,4 +2,5 @@
 host=gerrit.opencord.org
 port=29418
 project=ci-management.git
-defaultremote=origin
\ No newline at end of file
+defaultremote=origin
+defaultbranch=voltha-2.12