mysql-test/mysql-test-run.pl  :  Output the usage error if one is given. (Found when fixing bug#20303)
mysql-test/mysql-test-run.pl  :  Output the usage error if one is given. (Found when fixing bug#20303)


mysql-test/mysql-test-run.pl:
  Found when fixing bug#20303: The "usage()" function ignored the message it was given,
  so we got no real indication about the problem. Print it if one is given.

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