Java 8 failure unrelated:
```
org.apache.kafka.common.network.SslSelectorTest >
testCloseConnectionInClosingState FAILED
java.lang.AssertionError: Channel not expired expected null, but
was:<org.apache.kafka.common.network.KafkaChannel@4f>
...
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':clients:unitTest'.
> There were failing tests. See the report at:
> file:///home/jenkins/jenkins-slave/workspace/kafka-pr-jdk8-scala2.11/clients/build/reports/tests/unitTest/index.html
```
[ Full content available at: https://github.com/apache/kafka/pull/5693 ]
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