RFR 8154525, java/net/ServerSocket/ThreadStop.java fails intermittently with error while cleaning up threads after test

[Chris Hegarty]

> On 27 Sep 2016, at 03:08, Felix Yang <felix.yang at oracle.com> wrote:
> 
> Hi all,
> 
>    please review following test fix.
> 
> Bug:
> 
>    https://bugs.openjdk.java.net/browse/JDK-8154525
> 
> Webrev:
> 
>    http://cr.openjdk.java.net/~xiaofeya/8154525/webrev.00/
> 
> This test has been observed to fail sometimes with "Error while cleaning up threads after test ", even after test complete message printed. Updated it to run with othervm mode.

I think this is fine. Additionally, should the main thread wait/join 
the “Server” thread before exiting, to ensure that it is complete
before the test returns ( this would eliminate any potential race
while cleaning up ).

-Chris.