consolidate OwnedBroker that was not sure why it existed
consolidate OwnedBroker that was not sure why it existed

fix batching

wikimedia/operations-debs-python-pykafka,benauthor/pykafka,yungchin/pykafka,wikimedia/operations-debs-python-pykafka,aeroevan/pykafka,sammerry/pykafka,jofusa/pykafka,jofusa/pykafka,sammerry/pykafka,thedrow/samsa,wikimedia/operations-debs-python-pykafka,benauthor/pykafka,yungchin/pykafka,thedrow/samsa,thedrow/samsa,aeroevan/pykafka,benauthor/pykafka