Kafka brokers need to finish the shutdown process before the zookeepers do.
So start the zookeepers, then the kafka brokers will retry the shutdown process.

先關閉Kafka,等關閉完之后再關閉Zookeeper，否則，Kafka brokers無法關閉

參考：https://stackoverflow.com/questions/25568178/kafka-server-stop-sh-not-working-when-kafka-started-from-python-script