Code Review Request 8146669 Test SessionTimeOutTests fails intermittently

[Xuelei Fan]

Hi,

Please review the intermittently test failure fix.

    http://cr.openjdk.java.net/~xuelei/8146669/webrev.00/

In the updated test case, an integer (createdPorts) is used to count the
server sockets.  Every server socket is created in a new thread.  The
access and update to createdPorts should be synchronized for multiple
threading safe.  Update to use AtomicInteger.getAndIncrement() so that
the access and update to createdPorts is atomic.

Thanks,
Xuelei