Disallow LOAD DATA LOCAL INFILE

A customer reports that https://dev.mysql.com/doc/mysql-security-excerpt/5.1/en/load-data-local.html is critical. This issue is arouind a compromised MariaDB Server and through that getting access to client local files. As the issue is around a patched / compromised server, this issue has to be handled on the client side. The idea here is to have a configuration parameter that would disallow the MariaDB Connector to respond to requests for client local files.