mysql-test/r/mysqltest.result:
  Disable test for failing --exec and --system since output can't be piped to /dev/null on all platforms
mysql-test/t/mysqltest.test:
  Disable test for failing --exec and --system since output can't be piped to /dev/null on all platforms
  Avoid "echo -e" by using a temporary .sql file for tests that require more than one line.