Update kafka-server-stop.sh

[pengkeboy]

This script does not work on Kafka1.0. Kafka1.0 work well to use this script to stop the process.

[tombentley]

@pengkeboy you haven't referenced any reported issue. Please read https://cwiki.apache.org/confluence/display/KAFKA/Contributing+Code+Changes

[lisa2lisa]

I dont think that is a good way for handling this, if you have other kafka related instance running(e.g. mirrormaker or 2nd kafka instance running in the same box). this script might kill the wrong application. I think the proper way would be have a pid file.

[AlexanderThaller]

I went with a different approach maybe thats more appropiate: https://github.com/apache/kafka/pull/4487

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