RFR: 8245543: Cgroups: Incorrect detection logic on some systems (still reproducible) [v3]

[Bob Vandette]

On Wed, 7 Oct 2020 08:06:58 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> OK. I'll probably fold JDK-8254001 into this one then.
>
> @bobvandette Done in the latest version. Thoughts?

I'm a little uncomfortable making such a dramatic change just to fix this small isolated problem.   I think about all
the churn we've had on these files and the backports to come.  Could you just add a
CgroupSubsystemFactory::isValidSubsystem function which checks for cpuset, cpuacct, memory, etc instead of the major
change?

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PR: https://git.openjdk.java.net/jdk/pull/485