Added MariaDB config parser to properly connect to MariaDB backend for Job...

...SqlDAO

tested against MariaDB 5.5 running in a vagrant.
I would argue otherwise. Jobserver should be open to use MySQL or MariaDB, removing the mysql-connector-java dependency would take away the ability to work with MySQL (unless the mariadb-java-client can do that as well).

The other thing to do is to have a clever way of choosing your dependencies when you build the jobserver but that adds more complexity.