Test was flakey on some machines and showed spurious
reds for races.

New-and-improved test makes do with fewer statements,
no mysqltest-variables, and no backticks. Should hope-
fully be more robust. Heck, it's debatable whether we
should have a test for this, anyway.

mysql-test/suite/rpl/r/rpl_temporary.result:
  streamlined
mysql-test/suite/rpl/t/rpl_temporary.test:
  streamlined