RFR: 8334254: Cleanup CGroups initialization code

[Johan Sjölen]

On Fri, 14 Jun 2024 13:46:52 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> > set_subsystem_path is only used at construction time, only call it at that time and make those functions private. Also remove virtualness, as this is unnecessary now.
> 
> While this is true, we want to adjust a controllers path after construction going forward. https://bugs.openjdk.org/browse/JDK-8322420 is the bug likely needing this.

Isn't this a v2 feature? `set_subsystem_path` is a v1 method.

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PR Comment: https://git.openjdk.org/jdk/pull/19709#issuecomment-2184906512