RFR: 8326611: Clean up vmTestbase/nsk/stress/stack tests

[Leonid Mesnik]

The vmTestbase/nsk/stress/stack might be slightly refactored to improve reading. Mostly, simple refactoring.
Test logic was not changed, except removing verbose mode and enabling printing.

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Commit messages:
 - removed spaces.
 - 8326611: Clean up vmTestbase/nsk/stress/stack tests

Changes: https://git.openjdk.org/jdk/pull/17993/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17993&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326611
  Stats: 646 lines in 19 files changed: 56 ins; 349 del; 241 mod
  Patch: https://git.openjdk.org/jdk/pull/17993.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17993/head:pull/17993

PR: https://git.openjdk.org/jdk/pull/17993