RFR[8234103]: DatagramSocketImpl::socket is not needed

[Patrick Concannon]

Hi,

Could someone please review my fix for issue JDK-8234103 
'DatagramSocketImpl::socket is not needed' ?

DatagramSocketImpl has a socket field that links back to the 
DatagramSocket, which is only used to determine whether this 
DatagramSocket support Multicast or not. This fix removes the 
DatagramSocket object and replaces it with a boolean 'isMulticast' field 
in AbstractPlainDatagramSocketImpl.

bug: https://bugs.openjdk.java.net/browse/JDK-8234103
webrev: http://cr.openjdk.java.net/~pconcannon/8234103/webrevs/webrev.00/


Kind regards,

Patrick