RFR: 8376760: VerifyJimage.java#compare intermittent timed out with fastdebug

[SendaoYan]

Hi all,

Test tools/jimage/VerifyJimage.java#compare intermittent timed out with fastdebug build. I think it would be better to ajust the jtreg timeout factor(20*timeoutFactor) rather that set the fix timeout value(20) for awaitTermination.

The test run all passed 100 times simultancely.

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Commit messages:
 - Save timeout value to fail logs
 - 8376760: VerifyJimage.java#compare intermittent timed out with fastdebug

Changes: https://git.openjdk.org/jdk/pull/29498/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29498&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376760
  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/29498.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29498/head:pull/29498

PR: https://git.openjdk.org/jdk/pull/29498