update client tests w/ valid property instead of validate
update client tests w/ valid property instead of validate

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