Figure out how to do ser2net command line configuration (-C option)

Add a reliable transport mechanism that will run on top of UDP and
serial ports.  Create a message delimiter filter for serial ports to
get a message-based interface, then a reliable packet handler on top.
Probably add a crc16 implementation in the serial port message
delimiter.

Report an error if a mux or relpkt client tries to connect to a client.

serialdev devices cannot be used in a forked process because the UUCP lock
will not be correct.

Port selector changes to openipmi.

Remove os funcs from gensio_addr free function.

Add refcounts to gensio_addr to avoid having to duplicate.