[jdk11u-dev] RFR: 8293472: Incorrect container resource limit detection if manual cgroup fs mounts present

[Severin Gehwolf]

Clean backport. Testing on cg 1 and cg 2 passes for me.

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Commit messages:
 - 8293472: Incorrect container resource limit detection if manual cgroup fs mounts present

Changes: https://git.openjdk.org/jdk11u-dev/pull/1525/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1525&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293472
  Stats: 162 lines in 6 files changed: 108 ins; 27 del; 27 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1525.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1525/head:pull/1525

PR: https://git.openjdk.org/jdk11u-dev/pull/1525