mysqltest command 'shutdown_server' is supposed to shutdown the server
and wait for it to be gone, and kill it when timeout. But because the
arguments passed to my_kill were in the wrong order, 'shutdown_server'
does not wait nor kill the server at all. So after 'shutdown_server',
the server is still running, and the server may still accepting
connections.


mysql-test/include/mtr_warnings.sql:
  Suppress forcing close thread messages when server shuts down
mysql-test/include/restart_mysqld.inc:
  wait_until_disconnected.inc is not required after fix shutdown_server command