RFR: 8273921: Refactor NSK/JDI tests to create thread using factory [v6]

[Serguei Spitsyn]

On Tue, 21 Sep 2021 04:27:58 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> 8273921: Refactor NSK/JDI tests to create thread using factory
>
> Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixed line numbers after Idea autoimport.

I've reviewed all incremental updates.
Looks good to me.

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Marked as reviewed by sspitsyn (Reviewer).

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