[jdk17u-dev] RFR: 8278951: containers/cgroup/PlainRead.java fails on Ubuntu 21.10

[Goetz Lindenmaier]

I backport this for parity with 17.0.3-oracle.

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Commit messages:
 - Backport 35172cdaf38d83cd3ed57a5436bf985dde2d802b

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/155/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=155&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278951
  Stats: 5 lines in 2 files changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/155.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/155/head:pull/155

PR: https://git.openjdk.java.net/jdk17u-dev/pull/155