fix unit tests.
fix unit tests.

benauthor/pykafka,sammerry/pykafka,sontek/pykafka,yungchin/pykafka,thedrow/samsa,aeroevan/pykafka,yungchin/pykafka,wikimedia/operations-debs-python-pykafka,vortec/pykafka,benauthor/pykafka,sontek/pykafka,jofusa/pykafka,sammerry/pykafka,appsoma/pykafka,tempbottle/pykafka,wikimedia/operations-debs-python-pykafka,vortec/pykafka,fortime/pykafka,benauthor/pykafka,tempbottle/pykafka,appsoma/pykafka,aeroevan/pykafka,fortime/pykafka,jofusa/pykafka,wikimedia/operations-debs-python-pykafka,thedrow/samsa,thedrow/samsa