add worker name to the top of the log
add worker name to the top of the log

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