RFR: 8256417: Exclude TestJFRWithJMX test from running with PodMan

[Mikhailo Seledtsov]

On Thu, 25 Feb 2021 19:19:33 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

>> 8256417: Exclude TestJFRWithJMX test from running with PodMan
>
> Please review this small change that excludes the TestJFRWithJMX test from execution on Podman.
> In summary, this test requires capabilities that are not available under "rootless" podman.
> What was done:
>   - added an at-requires method to return the name of the container engine
>   - using the above named at requires to exclude this test as described above

@hseigel  @iignatev Could you please take a look?

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PR: https://git.openjdk.java.net/jdk/pull/2726