RFR: 8275259: Add support for Java level DCmd

[Denghui Dong]

On Thu, 14 Oct 2021 06:43:20 GMT, David Holmes <david.holmes at oracle.com> wrote:

> I'm not sure exactly where this API would need to go. IIUC jcmd doesn't
exist at the Java level it is just a tool, so introducing an API to
interact with it seems problematic to me. 

IMO, `jcmd` is a client of `dcmd`, the user also can use JMX to execute `dcmd`, this means there already are Java APIs interact with `dcmd`.

Denghui

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PR: https://git.openjdk.java.net/jdk/pull/5938