Switch from MySQL Connector/J JDBC client to MariaDB JDBC Client Library...

....

[Finishes #55528568]

A few notes:

* This uses version 1.1.1, which is a bit outdated
* MariaDB clients are not in maven, see: https://mariadb.atlassian.net/browse/CONJ-3
* We should probably setup a maven repo (or help MariaDB set theirs up) with all releases of the client

Test suite passes on MySQL