Fix URLs.
README:
  Fix URL.
mysqltest.result:
  Update test result for real_sleep error message.
mysqltest.c:
  Fix do_sleep() to print correct command name for real_sleep.


client/mysqltest.c:
  Fix do_sleep() to print correct command name for real_sleep.
mysql-test/r/mysqltest.result:
  Update test result for real_sleep error message.
mysql-test/README:
  Fix URL.
mysql-test/mysql-test-run.sh:
  Fix URLs.