Updated LICENSE year

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
A small fix to mysql::monit::slave

The mysql::monit::slave subclass now includes mysql::params, so that the
$mysql_executable parameter won't have an empty value in cases where a
MySQL-compatible is being used, and hence the base "mysql" class is not
included. Also added documentation to the mysql::monit::slave class.

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>