(kill_port): Deleted function, it was identical with
kill_io_fd_resource.
(lshd_port_accept): Converted from an oop callback to an accept
method for the io_listen_port class. Use SERVER_VERSION_LINE.
(make_lshd_port): Changed return type to struct resource *. Take a
sockaddr as argument, rather than an fd. Create and initialize the
socket. Use io_listen.
(open_ports): Creation of socket moved to make_lshd_port.
(main): Simplified logic slightly for the daemon mode.

Rev: src/lshd.c:1.180