RFR: 8269851: OperatingSystemMXBean getProcessCpuLoad reports incorrect process cpu usage in containers [v3]

[xpbob]

> …ocess cpu usage in containers

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

  add cpuset-cpus support

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4702/files
  - new: https://git.openjdk.java.net/jdk/pull/4702/files/3693793e..f9dadf7f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4702&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4702&range=01-02

  Stats: 52 lines in 1 file changed: 18 ins; 20 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4702.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4702/head:pull/4702

PR: https://git.openjdk.java.net/jdk/pull/4702