Remove NBI code from ltsp-trunk for all distros

AFAIK, NBI (Etherboot) support has been broken for years:
https://bugs.launchpad.net/ltsp/+bug/487826

I want to remove all of the NBI code from ltsp-trunk, so I'm proposing 
this commit:
http://bazaar.launchpad.net/~alkisg/+junk/ltsp/revision/2500

This touches files like dhcpd.conf from all distros, so please stop me 
from committing it if NBI images still work for you.

As for a workaround,
  * I think some etherboot clients support booting from pxelinux.0 (I 
had this in mind in the planned commit),
  * While for older etherboot clients that don't support pxelinux.0, 
someone that has such a client should create an ipxe.nbi wrapper, post 
it to our wiki and document how to change dhcpd.conf to boot from that.

I'll wait for a few days for feedback; if there's none, I'll go ahead 
and push.

Cheers,
Alkis

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