Windmill logs useless messages when running tests

[Björn Tillenius]

When running Windmill tests, you see messages like...

    Started ['/tmp/tmpDvKLQM.mozrunner/mozrunner-firefox'...

... and

    test_results: ERROR Test Failure in test {'version': '0.1', 'suite_name': 'Translation documentation links', 'result': False, 'starttime': '2009-11-9T19:31:52.13Z', 'output': None, 'debug': 'Looking up name loginpage_submit_login, failed.', 'params': {'name': 'loginpage_submit_login', 'uuid': '6626b2bc-e4cb-11de-938d-001e8cb51ce3'}, 'endtime': '2009-11-9T19:31:52.14Z', 'method': 'asserts.assertNode'}

The last message is especially annoying, since it looks like it's a test failure, when it in fact isn't.

Windmill currently hardcodes that logging should be set up. We could fix Windmill to allow logging to be turned off when calling start_windmill(), but for now, re-defining start_windmill() in LP should be fine, since it's really small.