appropriate code for a GRUB-specific option

[OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>]

  Hello,

  Currently I'm working on integrating diskless support into GRUB, so
that it will be able to be used in a diskless environment (PXE or
NBI). The support is quite trivial, as GRUB itself doesn't have to
provide the user any ROM images (because we use Etherboot, Netboot, or
a PXE ROM for the purpose).

  However, there is just one thing that I must consider
carefully. Christoph Plattner wrote a patch to get a configuration
file from a network and he used the option code 99 in BOOTP/DHCP to
specify the file name, but I think it was definitely bad, because we
should use 128-254 when we want to use non-standard options, according
to RFC 2132 (or 1497).

  So my question here is which code we should choose. I want to avoid
conflicting with Etherboot or other implementations, if possible. If
you have already determined that you will not use some regions in the
future, let me know, please.

Thanks,
Okuji
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