Install the default zuul status page.

On a zuul server, install the default status page as shipped by
Zuul (and its dependencies).

Remove openstack-specific redirects (hopefully it's been long enough
now).

Change-Id: Idfa2d9a4aa261182d166a36193fe74e1d922bcd9
Reviewed-on: https://review.openstack.org/29262
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Paul Belanger <paul.belanger@polybeacon.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins