Move git04.openstack.org to a new server

This moves git04.openstack.org to a new server, but should not be
merged until the old one is gracefully offlined in haproxy and the
new one is in sync with Gerrit replication and has been thoroughly
tested.

Change-Id: Ib15fe65bfd7e8099ae7ec1f4c9b08a15c4a7956e
Merge "Move git04.openstack.org to a new server"