- Read the pid from pidfile in order to be able to kill the real process
instead of the pseudo process. Most platforms will have the same real_pid
as pid
- Kill using the real pid


mysql-test/lib/mtr_process.pl:
  Kill using the "real_pid"
mysql-test/mysql-test-run.pl:
  Read the pid from pidfile in order to be able to kill the real process
  instead of the pseudo process. Most platforms will have the same real_pid
  as pid