Issue 21 Can't interrupt blocking accept

[gregw]

This is an attempted fix for #21
It does make it a little better as the testAcceptCloseInterrupt() test now sometimes passes (1 in 5 runs on my machine), but it has not fixed the problem generally.

Probably not worthwhile merging, just wanted to move #21 on.

[headius]

Can you fix the formatting throughout this PR to match how the rest of the code does it, please? Standard Java coding conventions, four space indentation, no tabs, etc.

[headius]

Sorry this got left on the shelf so long. I submitted a review that needs some changes.

[gregw]

@headius formatting was fixed some time ago. I've just merged from master to freshen this up.
No idea yet why CI is failing.... but I think this is a needed change (now duplicated by #52)

[gregw]

Oh formatting again... sorry.... fixing...

[gregw]

@headius can you re-review this one?

[gregw]

@headius actually this is now not working reliably... so the fix is not good... but the issue is important.
Edit: re-reading my initial comment.... indicates that this never really worked and it was just a speculative change. So consider this PR to contain only a test and not a fix.

[headius]

@gregw Sorry for dropping the ball on this but thank you for the update. I'll close this and we'll look at another fix.