RFR: 8292695: SIGQUIT and jcmd attaching mechanism does not work with signal chaining library

[Man Cao]

On Mon, 22 Aug 2022 20:38:36 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> make sense.
>
> There can be issues using vmTestbase as a library, simply due to the fact that jtreg does not handle libraries particularly well and we can end up with NoClassDefFoundError at runtime due to "split packages".

Should I implement sendCtrlBreak() outside of /vmTestbase in this PR then?
The new test did run and pass on Github pre-submit check.

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PR: https://git.openjdk.org/jdk/pull/9955