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

[Serguei Spitsyn]

On Wed, 15 Sep 2021 00:34:08 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

> 8273921: Refactor NSK/JDI tests to create thread using factory

Hi Leonid,
The refactoring looks great.
I also like that some unneeded constructors and fields go away.
Thanks,
Serguei

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Marked as reviewed by sspitsyn (Reviewer).

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