Zuul can now provide links to the status page if a url for that page is
included in the zuul configuration. Add the status_url option to the
zuul config erb and default it to https://$fqdn/zuul/status.
Change-Id: I160a4e1cd71a13981cb171c71a923cc1af753a80
Reviewed-on: https://review.openstack.org/13859
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins