RFR: 8349533: Refactor validator tests shell files to java [v6]

[duke]

On Mon, 24 Feb 2025 20:08:12 GMT, Mikhail Yankelevich <duke at openjdk.org> wrote:

>> Changed shell files to be java tests:
>> * ./validator/certreplace.sh
>> * ./validator/samedn.sh
>
> Mikhail Yankelevich has updated the pull request incrementally with one additional commit since the last revision:
> 
>   missing close file

@myankelev 
Your change (at version 2985d18f7b14197956232b369f3e036420818e76) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/23727#issuecomment-2679570563