I tested the kafka-console-producer that adding --producer-property key=value
```
bin/kafka-console-producer.sh --broker-list test.com:9093 --topic test
--producer-property sasl.mechanism=TEST --producer-property
security.protocol=TEST --producer-property sasl.kerberos.service.name=TEST
```
overrides the entries in the client properties as expected:
```
sasl.kerberos.service.name = TEST
...
sasl.mechanism = TEST
security.protocol = TEST
```
I also verified that it works with kafka-console-consumer:
```
bin/kafka-console-consumer.sh --bootstrap-server test:9093 --topic test
--consumer-property sasl.mechanism=TEST --consumer-property
security.protocol=TEST --consumer-property sasl.kerberos.service.name=TEST
--consumer.config /tmp/client.properties
```
[ Full content available at: https://github.com/apache/kafka/pull/5660 ]
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