[jdk11u-dev] RFR: 8287107: CgroupSubsystemFactory.setCgroupV2Path asserts with freezer controller

[Severin Gehwolf]

Clean backport. Issue present on 11.0.16 too, low risk.

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Commit messages:
 - Backport 704b9a66bba0dc8adb62be80fd62864b9c687c3f

Changes: https://git.openjdk.org/jdk11u-dev/pull/1340/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1340&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287107
  Stats: 117 lines in 3 files changed: 114 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1340.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1340/head:pull/1340

PR: https://git.openjdk.org/jdk11u-dev/pull/1340