RFR: 8265104: CpuLoad and SystemCpuLoad in OperatingSystem MXBean returns -1.0

Mon, 12 Apr 2021 22:02:12 -0700 

I got -1.0 from both CpuLoad and SystemCpuLoad in OperatingSystem MXBean when I 
run the application on Fedora 33 x64 which is installed cgroups V2.

![jconsole-cpuload](https://user-images.githubusercontent.com/7421132/114485721-6372a180-9c47-11eb-81d9-568324cba336.png)

I do not run the application in the container, nor do not run with resource 
limitation on cgroups, so JMX should report CPU load on host value in this case.

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Commit messages:
 - 8265104: CpuLoad and SystemCpuLoad in OperatingSystem MXBean returns -1.0

Changes: https://git.openjdk.java.net/jdk/pull/3447/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3447&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265104
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3447.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3447/head:pull/3447

PR: https://git.openjdk.java.net/jdk/pull/3447

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