RFR: JDK-8293472: Cgroup: 'stomping of _mount_path' crash if manually mounted cpusets exist [v2]

[王超]

> Similar to [JDK-8253435](https://bugs.openjdk.org/browse/JDK-8253435), when setting the mount path of cgroup controller "memory/cpu/cpuacct/pids", it should also discard duplicate items.

王超 has updated the pull request incrementally with one additional commit since the last revision:

  Explicit use name

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10193/files
  - new: https://git.openjdk.org/jdk/pull/10193/files/eb9c58b0..f989ad13

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10193&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10193&range=00-01

  Stats: 12 lines in 2 files changed: 4 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/10193.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10193/head:pull/10193

PR: https://git.openjdk.org/jdk/pull/10193