RFR[8233018]: Add a new test to verify that DatagramSocket is not interruptible

[Patrick Concannon]

Hi,


Could someone please review my fix for issue JDK-8233018 'Add a new test 
to verify that DatagramSocket is not interruptible'?

This fix adds a test to check the interruptability of DatagramSocket, 
MulticastSocket and DatagramSocketAdaptor.


bug: https://bugs.openjdk.java.net/browse/JDK-8233018

webrev: http://cr.openjdk.java.net/~pconcannon/8233018/webrevs/webrev.00/


Kind regards,

Patrick