When executing tests within OpenStack-CI, the MariaDB mirror implemented in CopenStack-Infra will be used instead of the Rackspace mirror. This should speed up OpenStack-CI testing and be more reliable as it eliminates external dependencies and does not rely on a single mirror as a source. For the sake of record, the MariaDB mirror was implemented in OpenStack-Infra with these reviews: - https://review.openstack.org/307831 - https://review.openstack.org/354203 - https://review.openstack.org/440769 Change-Id: I7254bc246525488f1b94a3835786307057a906c1