jmx-dev RFR: 8269851: OperatingSystemMXBean getProcessCpuLoad reports Process CPU usage

[xpbob]

…ocess cpu usage inside a container

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Commit messages:
 - 8269851: OperatingSystemMXBean getProcessCpuLoad reports incorrect process cpu usage inside a container

Changes: https://git.openjdk.java.net/jdk/pull/4700/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4700&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269851
  Stats: 41 lines in 1 file changed: 41 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4700.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4700/head:pull/4700

PR: https://git.openjdk.java.net/jdk/pull/4700