RFR: JDK-8195809: [TESTBUG] jps and jcmd -l support for containers is not tested

[Mikhailo Seledtsov]

On Sat, 4 Sep 2021 00:03:14 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

> Please review this addition of new testing:
>   - new test for sending jcmd commands across container boundaries
>   - updated existing sidecar test, enabling jcmd test case

@hseigel and Kevin Walls, please review when you have a chance

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PR: https://git.openjdk.java.net/jdk/pull/5368