* dbus/dbus-server-unix.c (unix_finalize): Don't unref
	unix_server->watch here, it is unreffed in disconnect.
	(_dbus_server_new_for_tcp_socket): convert NULL host to
	"localhost" here so we don't append NULL to address.

	* dbus/dbus-server.c (_dbus_server_test): Add test case for
	various addresses, including tcp with no explicit host.