RFR: 8029525 - java/lang/ProcessBuilder/Basic.java fails intermittently

[Rob McKenna]

This failure cropped up again and Roger Riggs spotted that I was looking 
at it from completely the wrong direction. He contributed the following fix:

http://cr.openjdk.java.net/~robm/8029525/webrev.01/

This is to avoid a race between:

thread.interrupt();
p.destroy();

Hoping to get this reviewed and pushed as soon as possible!

Thanks,

     -Rob