RFR: 7904076: Include timestamp in the summary logs for junit and testng tests

[Jaikiran Pai]

Can I please get a review of this change which enhances the log messages printed by jtreg when summarizing the test execution?

With this change, the started/finished log messages will now look like:

For testng:

[09:10:12.473] test p.q.Pass.m1(): success [10ms]
[09:10:13.123] test p.q.Pass.m2(): success [202ms]


For junit:

[09:55:22.278] STARTED    p.JUnitTest::test 'test'
[09:55:22.279] SUCCESSFUL p.JUnitTest::test 'test' [1ms]


The timestamp associated with these logs would help during investigating test failures or test timeouts. No new self test has been added given the nature of this change.

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Commit messages:
 - 7904076: Include timestamp in the summary logs for junit and testng tests

Changes: https://git.openjdk.org/jtreg/pull/286/files
  Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=286&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7904076
  Stats: 39 lines in 2 files changed: 26 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jtreg/pull/286.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/286/head:pull/286

PR: https://git.openjdk.org/jtreg/pull/286