Backporting from 5.0


mysql-test/mysql-test-run.pl:
  Backporting from 5.0
mysql-test/lib/mtr_process.pl:
  Backporting from 5.0
mysql-test/lib/mtr_report.pl:
  Backporting from 5.0
mysql-test/lib/mtr_timer.pl:
  Backporting from 5.0