processor-pool: log if we can't subscribe to build queue
processor-pool: log if we can't subscribe to build queue

travis-ci/worker,henrikhodne-abandoned/worker,henrikhodne-abandoned/worker,solarce/worker,Acidburn0zzz/worker,henrikhodne-abandoned/worker,solarce/worker,solarce/worker,travis-ci/worker,Acidburn0zzz/worker,Acidburn0zzz/worker,travis-ci/worker