sidekiq 2.17.8 won't handle queues seperated by ,

See https://github.com/gitlabhq/gitlabhq/issues/8508 and https://github.com/gitlabhq/gitlabhq/issues/8490
Merge pull request #249 from drmonty/patch-1

sidekiq 2.17.8 won't handle queues seperated by ,