[jdk8u-dev] RFR: 8253435: Cgroup: 'stomping of _mount_path' crash if manually mounted cpusets exist [v6]

[Jonathan Dowland]

> This is a backport of 8253435 to jdk8u-dev for cgroups v2 support.

Jonathan Dowland has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Severin's test fixes. Thanks!
 - Replace log_warning with tty->print_cr
 - 8253435: Cgroup: 'stomping of _mount_path' crash if manually mounted cpusets exist
   
   Backport-of: 0054c15f60cce6470be05d29bfacbdb74cfb7bc9

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Changes: https://git.openjdk.org/jdk8u-dev/pull/158/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=158&range=05
  Stats: 44 lines in 2 files changed: 41 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/158.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/158/head:pull/158

PR: https://git.openjdk.org/jdk8u-dev/pull/158