RFR: JDK-8293472: Potentially incorrect container resource limit detection if manual cgroup fs mounts present [v7]

[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:

  Simplify cg2 code

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10193/files
  - new: https://git.openjdk.org/jdk/pull/10193/files/5b73d9dd..68008b00

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10193&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10193&range=05-06

  Stats: 48 lines in 4 files changed: 0 ins; 28 del; 20 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