Update gitreview file

Related-prod: PROD-22634

Change-Id: Ie0931ef9ed70206fff14c4a73535493b8581a693
(cherry picked from commit b9c2712cc03c043c7dff67f471f6651d5bace1b7)
(cherry picked from commit 3111a81053f4a50b459e247128fddcaa24e4f8b8)
diff --git a/.gitreview b/.gitreview
index 6bb4f8e..f428d87 100644
--- a/.gitreview
+++ b/.gitreview
@@ -1,4 +1,5 @@
 [gerrit]
-host=review.openstack.org
+host=gerrit.mcp.mirantis.com
 port=29418
-project=openstack/tempest-horizon.git
+project=packaging/sources/tempest-horizon.git
+defaultbranch=mcp/xenial/rocky