Add ability to exclude queues by flag option --exclude_specified_queues

[one-more-alex]

This is related to https://github.com/collectiveidea/delayed_job/pull/466 https://github.com/collectiveidea/delayed_job/pull/901

[metalelf0]

Hey @one-more-alex, this is really good, and I'd love this to get merged. However I suppose it's not gonna be considered unless all the checks in the build are successful. They configured some kind of blatantly zealous rubocop, so would you mind fixing the offenses in the build? I can help you with that if you need. Thanks!