Use mysql.service instead of mariadb.service to start MariaDB service on openSUSE
Use mysql.service instead of mariadb.service to start MariaDB service on openSUSE

systemctl enable mariadb.service is not working on openSUSE 13.1:

---snip---
% sudo systemctl enable mariadb.service
Failed to issue method call: No such file or directory
---snap---

Change-Id: I50034a76707259fb9e871e53a8e378dab48ab8fa

openstack/openstack-manuals,gongysh2004/openstack-manual,AlekhyaMallina-Vedams/openstack-manuals,gongysh2004/openstack-manual,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,kairoaraujo/openstack-manuals,potsmaster/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,potsmaster/openstack-manuals,saeki-masaki/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,saeki-masaki/openstack-manuals