This makes the test non-repeatable when running as root.
 So I change to not use the "" user, but a random string which will
 always result in the @localhost user being selected by the server.


mysql-test/t/rpl_temporary.test:
  mysql_real_connect picks the Unix login when the user "" is used.
  This makes the test non-repeatable when running as root.
  So I change to not use the "" user, but a random string which will
  always result in the @localhost user being selected by the server.