彻底删除kafka的topic

参考https://stackoverflow.com/questions/33537950/how-to-delete-a-topic-in-apache-kafka/33538299

1. 停掉 kafka
2. 删除 kafka 配置中 /tmp/kafka-logs 中 topic 的目录
3. bin/zookeeper-shell.sh localhost:2181
4. ls /brokers/topics
5. rmr /brokers/topics/yourtopic
6. 重启 kafka