Use new openstack-specific mirror.
Use new openstack-specific mirror.

Change-Id: I60dae939a1306c78d0da8ba6ae58fe4265ee97fb
Reviewed-on: https://review.openstack.org/23778
Reviewed-by: Jeremy Stanley <98883b97e35b7bb1ac282bb863f2e9d917db0454@yuggoth.org>
Approved: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Tested-by: Jenkins

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