Bump minor version of mariadb
Bump minor version of mariadb

This bumps the mariadb version, by adding a new repo.
As the package state is by default to "latest", the
addition of the new repo will trigger an upgrade
of the mariadb version.

Change-Id: Id68221847e62626f13d1d871c1dee28508e4896a
Depends-On: https://review.openstack.org/#/c/572366/

os-cloud/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server,openstack/openstack-ansible-galera_server,openstack/openstack-ansible-galera_server