OpenJDK SADebugDTest.java test : handling of "Address already in use"

[Baesken, Matthias]

Hi Yasumasa, thanks for addressing the issue .

I put your patch into our internal nightly test queue .

Best regards, Matthias

>
>> `testResult` and `portInUse` are important variables in this logic,
>> however they are overwritten in lambda expression - they won't affect
>> to the caller.
>> (I wonder why the test can compile without any error...)
>
>They are class member, so they work fine.
>However it is a little confusing, so I refactored it in this PR.
>