public class PlainMulticastSocketImpl extends PlainDatagramSocketImpl
This class was added so we can create sockets with options that are needed
for server sockets. It just overrides create so that we call new natives
which only set the options required for server sockets. In order to preserve
behaviour of older versions the create PlainSocketImpl was left as is and
this new class was added. For newer versions an instance of this class is
used, for earlier versions the original PlainSocketImpl is used.
