netpipe port for plan9

Stuff that doesn't work in the native p9 port of netpipe (gosh, is it 
ever ugly in that code!):

port -- netpipe for p9 defaults to 5555. I suggest you use that
setsockopt -- useless in p9
printing debug information -- this is set to 1 all the time, turning
	it on has no effect
maybe some other things that don't work when attempted, may be buffer 
	size or whatnot

so, simply mk, on the client side do: 8.out -r
on the server side do: 8.out -t -h <client hostname> 

and enjoy :)