jmx-dev RFR: 8327505: Test com/sun/jmx/remote/NotificationMarshalVersions/TestSerializationMismatch.java fails

[Kevin Walls]

Client.java has a fixed 30-second timeout on the CountDownLatch to wait for 10 notifications.

If it fails, you can't tell if CountDownLatch.await threw, or returned false and the app threw InterruptedException, due to the way Client.java handles these.

Seems most likely the 30 second wait expired, as we are dealing with -Xcomp failures in a debug build.  Passing runs can take a few seconds, but can be 25 seconds.

Increasing the timeout and tidying up the handling so we can see the specific reason in future.

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Commit messages:
 - 8327505: Test com/sun/jmx/remote/NotificationMarshalVersions/TestSerializationMismatch.java fails

Changes: https://git.openjdk.org/jdk/pull/18381/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18381&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327505
  Stats: 7 lines in 1 file changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18381.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18381/head:pull/18381

PR: https://git.openjdk.org/jdk/pull/18381