RFR: CODETOOLS-7903748 - jcstress: Test list should honor concurrency settings

[Jiří Vaněk]

This is extracting  List<TestConfig> configs =prepareRunProgram(classes, tests);
with all he HW/switches setup to separated method and reusing it in `-l` mode

I'm aware of triplicated removal of -agentlib, and will clean it up as
CODETOOLS-7903756 will progress.

-l now honours also verbose mode, in which it prints not just matching
tests but all really run tests, and thus enabling much more easy
determining of all tests

help adjusted.

Maybe I'm missing plain quick initial all tests metod now, but with 
artificial -c MAX it seems doing exactly that

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Commit messages:
 - CODETOOLS-7903748 - jcstress: Test list should honor concurrency settings
 - CODETOOLS-7903756 - jcstress shuld not pass debugging parameters to subproceses

Changes: https://git.openjdk.org/jcstress/pull/149/files
  Webrev: https://webrevs.openjdk.org/?repo=jcstress&pr=149&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903748
  Stats: 103 lines in 6 files changed: 76 ins; 18 del; 9 mod
  Patch: https://git.openjdk.org/jcstress/pull/149.diff
  Fetch: git fetch https://git.openjdk.org/jcstress.git pull/149/head:pull/149

PR: https://git.openjdk.org/jcstress/pull/149