clean up worker logging
clean up worker logging

dask/distributed,amosonn/distributed,blaze/distributed,broxtronix/distributed,amosonn/distributed,dask/distributed,amosonn/distributed,mrocklin/distributed,dask/distributed,mrocklin/distributed,blaze/distributed,dask/distributed,broxtronix/distributed,broxtronix/distributed,mrocklin/distributed