RFR: 8253435: Cgroup: 'stomping of _mount_path' crash if manually mounted cpusets exist

[Volker Simonis]

On Tue, 22 Sep 2020 14:13:02 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> Did you run container tests with this?

Yes. It took me some time to find out that I have to set `-Djdk.test.docker.image.name=ubuntu` and
`-Djdk.test.docker.image.version=18.04` on Ubuntu in order to run them :)

For release builds they all pass with and without the change (except `TestJFRWithJMX.java` which always fails, but I
don' t think that's related to this issue). Fast- and slowdebug builds don't even start without the fix and pass all
the tests with it (again except `TestJFRWithJMX.java`).

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PR: https://git.openjdk.java.net/jdk/pull/295