RFR: 8294402: Add diagnostic logging to VMProps.checkDockerSupport [v8]

[Mikhailo Seledtsov]

On Wed, 15 Feb 2023 00:38:15 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

>> Add log() and logToFile() methods to VMProps for diagnostic purposes.
>
> Mikhailo Seledtsov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Addressed recent review feedback from Leonid

Thank you David, Leonid and Dan.

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PR: https://git.openjdk.org/jdk/pull/12239