Add releasestatus under openstack-infra

Add releasestatus to gerrit under openstack-infra.
This won't use gate tests or generate tarballs for the time being.

Change-Id: Ifd6afcea632d78d2900cf51de835e07700ef1c7c
Reviewed-on: https://review.openstack.org/29235
Reviewed-by: Paul Belanger <paul.belanger@polybeacon.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins