8315437: Enable parallelism in vmTestbase/nsk/monitoring/stress/classload tests

[luchenlin]

I backport this for parity with 11.0.25-oracle.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8315437 needs maintainer approval

Issue

• JDK-8315437: Enable parallelism in vmTestbase/nsk/monitoring/stress/classload tests (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev.git pull/2755/head:pull/2755
$ git checkout pull/2755

Update a local copy of the PR:
$ git checkout pull/2755
$ git pull https://git.openjdk.org/jdk11u-dev.git pull/2755/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2755

View PR using the GUI difftool:
$ git pr show -t 2755

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk11u-dev/pull/2755.diff

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[bridgekeeper]

👋 Welcome back andrewlu! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (b6a5d7b3)