Add back setting the Travis::Amqp config
Add back setting the Travis::Amqp config

While this file doesn't use the Travis::Amqp library, other dependencies do, so
adding the configuration back here is the easiest way to get around it.

ireznice/travis-worker,ireznice/travis-worker,final-ci/travis-worker,gavioto/travis-worker,travis-ci/travis-worker,final-ci/travis-worker,gavioto/travis-worker,travis-ci/travis-worker