asio: Resolve using the same io_service as owner Socket.
asio: Resolve using the same io_service as owner Socket.

Bad stuff was the creation of an extra unused thread.

	* lib/libport/asio-impl.hxx (resolve): Take the io_service
	as argument.
	(listenProto, connectProto): Pass our io_service.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport