We are now using the mariadb jdbc connector in production and no longer
need to include the mysql legacy connector in our images. We also don't
need support for h2 or mysql as testing and prod are all using the
mariadb connector and local database.
Note this is a separate change to ensure everything is happy with the
mariadb connector before we remove the fallback mysql connector from our
images.
Change-Id: I982d3c3c026a5351bff567ce7fbb32798718ec1b
75e0cf106a