Code review comment for lp:~eday/drizzle/eday-dev

This adds the --mysql option to tools, which can be used to run the test suite using the MySQL protocol (just pass --mysql option to all client tools in test_run.pl). I'm not modifying the test suite now since other work is being done there. I'd like to create a make test-mysql or something which would set this flag to be passed through and test on the different port/protocol.