Straighten out and comment behaviour for --require and --result in run_query


client/mysqltest.c:
   If --require or --result has been provided for a query command->record_file file be set.
  In that case it should either dump to file if recording or check with content in file if running.
mysql-test/r/mysqltest.result:
  Fix up tests and results after merge
mysql-test/t/mysqltest.test:
  Fix up tests and results after merge