RFR: 8316693: Simplify at-requires checkDockerSupport()

[Daniel D. Daugherty]

On Thu, 12 Oct 2023 17:13:02 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

>> I don't see how this comment was resolved. Did I miss something?
>
> Sorry I missed this one. Filed: [JDK-8318029](https://bugs.openjdk.org/browse/JDK-8318029)
> Minor improvement to logging output in container at-requires
> Will address soon.

Thanks for the follow-up bug. I linked [JDK-8318029](https://bugs.openjdk.org/browse/JDK-8318029) to the original.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16111#discussion_r1357163198