[jdk11u-dev] RFR: 8253714: [cgroups v2] Soft memory limit incorrectly using memory.high

[Zhengyu Gu]

A clean backport to replace dependency PR [865](https://github.com/openjdk/jdk11u-dev/pull/865) that resulted many conflicts.

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Commit messages:
 - Backport ff6843ca4842498791061f924c545fa9469cc1dc

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/941/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=941&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253714
  Stats: 4 lines in 3 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/941.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/941/head:pull/941

PR: https://git.openjdk.java.net/jdk11u-dev/pull/941