Append to some of the log files, not overwrite.
  Changed introduction text to reflect the current
  status of the Perl version of mysql-test-run.
  Some code cleanup.


mysql-test/mysql-test-run.pl:
  Append to some of the log files, not overwrite.
  Changed introduction text to reflect the current
  status of the Perl version of mysql-test-run.
  Some code cleanup.