first cut at (user space) 802.1x supplicant program.

first of all, I'm not particularly proud of the code --
this is work in progress, the second rough version that works.
it definitely needs cleaning up
(in particular: global variables, creating/parsing of messages,
 debugging output (reduce amount, make more useful),
 integration of 802.1x-document based state machines
 with plan 9 thread style of dealing with multiple open files,
 get rid of compiler warnings).
I hope this will happen in due time.

I'm making this available to allow constructive criticism.


This depends on:
 - the tlshand patches I submitted on sources/patch
    and which have been applied in the mean time
 - fastkey support in wlan driver
     (separate wavelan.[ch] etherwavelan.c)

It assumes a writable, append-only /sys/log/8021x file.
command line option -d outputs lots of debugging
command line option -D outputs tls handshake debugging


TODO:
 - code cleanup
 - see if we can fix memory leak (leaking 32K per re-auth?)
 - see why we sometimes go throught the tls handshake
    multiple times (error in my state machines?)
 - see  why we sometimes get error
        'invalid initial SSL2-like message'
 - look at checking server certificate
    (as done in some of the programs that use tlsClient)
 - reduce (debug) output to syslog
 - use tls session resumption (here it takes about 15 sec
    for tlsCLient to complete the handshake),
    but for that we first need to enhance tlsClient
    (and thus tlshand/tlsdev)
    with support for tls session resumption

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