RFR: 7903781: Report the process id of the agent or other VM that was used for a jtreg action

[Jaikiran Pai]

Can I please get a review of this change which proposes to repor the process id of the process that was used to run a jtreg action? This change addresses https://bugs.openjdk.org/browse/CODETOOLS-7903781.

As noted in that linked enhancement request, this change will report the process id  the `section` messages of each action. This will now look like:


#section:compile
----------messages:(7/297)----------
command: compile test/streams/FileDescriptorTest.java
reason: .class file out of date or does not exist
started: Fri Jul 26 00:56:01 UTC 2024
Mode: othervm
Process id: 88469
finished: Fri Jul 26 00:56:01 UTC 2024
elapsed time (seconds): 0.254

....

#section:main
----------messages:(7/232)----------
command: main FileDescriptorTest
reason: User specified action: run main FileDescriptorTest 
started: Fri Jul 26 00:56:01 UTC 2024
Mode: othervm
Process id: 88470
finished: Fri Jul 26 00:56:01 UTC 2024
elapsed time (seconds): 0.042

Notice the new "Process id: ..." line in those sections.

-------------

Commit messages:
 - 7903781: Report the process id of the agent or other VM that was used for a jtreg action

Changes: https://git.openjdk.org/jtreg/pull/215/files
  Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=215&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903781
  Stats: 100 lines in 7 files changed: 66 ins; 28 del; 6 mod
  Patch: https://git.openjdk.org/jtreg/pull/215.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/215/head:pull/215

PR: https://git.openjdk.org/jtreg/pull/215