RFR: 8287663 Add a regression test for JDK-8287073

[Ioi Lam]

On Thu, 2 Jun 2022 14:32:28 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> This adds a regression test for a recent fix (JDK-8287073). I've restructured the linux specific JDK code to call a separate static function to enable this test. It'll help future tests too.
> 
> Testing:
> - [x] Container tests continue to pass + GHA
> - [x] New regression test fails prior the code fix of JDK-8287073 and passes with it

Not specific to this PR, but we have a general problem with lots of duplication between these two files. E.g.,


https://github.com/openjdk/jdk/blob/a50b06e85124f61b5133189a2a2e461753d5d9e7/test/hotspot/jtreg/containers/cgroup/CgroupSubsystemFactory.java#L132-L143

https://github.com/openjdk/jdk/blob/a50b06e85124f61b5133189a2a2e461753d5d9e7/test/jdk/jdk/internal/platform/cgroup/TestCgroupSubsystemFactory.java#L130-L143

We should try to consolidate these test cases to improve maintainability.

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PR: https://git.openjdk.java.net/jdk/pull/8993