RFR: 8273921: Refactor NSK/JDI tests to create thread using factory [v2]

[Leonid Mesnik]

On Mon, 20 Sep 2021 22:08:19 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> I've gotten through about 1/3 of the test plus the new files, so thought I'd pass along my comments so far. Overall it looks good though.
>
>> I've gotten through about 1/3 of the test plus the new files, so thought I'd pass along my comments so far. Overall it looks good though.
> 
> I went through the rest of the files. No new issues, so just waiting for a response to my previous comments.

@plummercj, @sspitsyn, @alexmenkov  Thank you for review, I found some more tests to update. Will update PR soon.

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PR: https://git.openjdk.java.net/jdk/pull/5515