RFR: 8332535: Discard any message not expected in Loopback.java [v7]

[Daniel Fuchs]

On Thu, 27 Jun 2024 07:28:39 GMT, SendaoYan <syan at openjdk.org> wrote:

>> Hi all,
>>   The test `test/jdk/java/nio/channels/DatagramChannel/Loopback.java` intermittent fail, the failure probability is about 2/1000. This PR mark this test intermittent, and print more messages to investigate the intermittent failure. Only change the testcase, no risk.
>
> SendaoYan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   delete @key intermittent

Actually - maybe we should use [JDK-8269657](https://bugs.openjdk.org/browse/JDK-8269657) for this change, since it fixes the test failure.
FWIW - I have launched some repeated tests in our CI - so far this looks promising :-)

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PR Comment: https://git.openjdk.org/jdk/pull/19314#issuecomment-2194365612