async_poll_for and not poll_for inside a @gentest test
this test does not work for me on Py3.3

but commiting the rename was not intentional
travis fix

https://travis-ci.org/mozilla-services/circus/jobs/13059742#L506
Merge pull request #607 from thefab/again_some_random_test_fails

[READY TO MERGE] async_poll_for and not poll_for inside a @gentest test