[jdk8u-dev] RFR: 8253797: [cgroups v2] Account for the fact that swap accounting is disabled on some systems [v2]

[Jonathan Dowland]

> This is a clean backport of 8253797 (via 11u) for jdk8u-dev for cgroups v2 support.
> 
> The changed files are exercised by the jtreg test `TestSystemMetrics.java` which passes on my cgroups v2 system.

Jonathan Dowland has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/185/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/185/files/48414a2a..48414a2a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=185&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=185&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/185.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/185/head:pull/185

PR: https://git.openjdk.org/jdk8u-dev/pull/185