[jdk11u-dev] RFR: 8239537: cgroup MetricsTester testMemorySubsystem fails sometimes when testing memory.kmem.tcp.usage_in_bytes

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport ed94c0af103a806c128ce0085f58bc4fc878b717

Changes: https://git.openjdk.org/jdk11u-dev/pull/1980/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1980&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8239537
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1980.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1980/head:pull/1980

PR: https://git.openjdk.org/jdk11u-dev/pull/1980