[jdk8u-dev] RFR: 8291570: [TESTBUG] Part of JDK-8250984 absent from 11u

[Jonathan Dowland]

This is a clean backport of 8291570 (from jdk11u) as part of cgroups v2 support.

The affected test passes for me after the patch.

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Depends on: https://git.openjdk.org/jdk8u-dev/pull/171

Commit messages:
 - 8291570: [TESTBUG] Part of JDK-8250984 absent from 11u

Changes: https://git.openjdk.org/jdk8u-dev/pull/175/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=175&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291570
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/175.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/175/head:pull/175

PR: https://git.openjdk.org/jdk8u-dev/pull/175