[jdk11u-dev] RFR: 8315437: Enable parallelism in vmTestbase/nsk/monitoring/stress/classload tests

[Andrew Lu]

I backport this for parity with 11.0.25-oracle.

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Commit messages:
 - Backport dd214d0f9543f125ef514eb3a60a65a5f514b1ca
 - Merge branch 'openjdk:master' into master
 - Backport b419e9517361ed9d28f8ab2f5beacf5adfe3db91

Changes: https://git.openjdk.org/jdk11u-dev/pull/2755/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2755&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315437
  Stats: 791 lines in 25 files changed: 214 ins; 556 del; 21 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2755.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2755/head:pull/2755

PR: https://git.openjdk.org/jdk11u-dev/pull/2755