Move Zuul to its own server.
Move Zuul to its own server.

Remove zuul from jenkins server.
Remove transitional zuul config.
Add an extra argument to gerrit-git-prep for the git site name, so that it
doesn't have to be the same as the review site.
Serve zuul git repos via apache.

Change-Id: I342032bcedf317c0f48ff89b773546eb2ccd08f8
Reviewed-on: https://review.openstack.org/17949
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <98883b97e35b7bb1ac282bb863f2e9d917db0454@yuggoth.org>
Approved: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Reviewed-by: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Tested-by: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>

open-switch/infra_puppet-jenkins,open-switch/infra_puppet-jenkins