Switch to mariadb on openSUSE

The mysql-community-server is a compat provide, openSUSE uses
mariadb for quite some time. Make it futureproof in case
the compat provide goes away in the future. Cleanup
mysql service name to MYSQL_SERVICE_NAME and consistently
use it.

Change-Id: I2df7b8d8b798dfa7ceade90e0c127e0609524a8b
1 file changed