Current mariadb.com mirror that's being cached by infra does not
contain modern MariaDB versions and can't be used any longer for
testing.
Once we switch to mariadb.org and infra configuration will be in place,
we should return usage of local cached mirror.
It also unconditionally re-configures AIO during upgrade as we
need to remove usage of CI mirrors there after N-1 deployment
is done
Needed-By: https://review.opendev.org/c/openstack/openstack-ansible-galera_server/+/924354
Change-Id: I0af801c64b23107cafe99ac27f22f50ca669d26e
fb7de5866d