Etherboot/BSD Netboot root_path tag handling

[Klaus Espenlaub <espenlaub@informatik.uni-ulm.de>]

Currently the root_path vendor tag (id 17) is basically ignored using
mknbi-linux.  The assembler code dealing with the root filesystem path
only looks at the tag if no boot file name is known - a case that will
never happen at least with Etherboot.  So generally you'll end up with the
dirname of the boot file.

The Linux Terminal Server Project already ran into this but worked around
by using the -d switch to set the root directory name inside the nbi image.
However this should be just a temporary hack in my opinion.

Any votes against a small patch to the first.S file that reverses the order
of things - first the DHCP/BOOTP tag, then the boot file dirname?

I haven't modified the file yet due to lack of time, but will do so next week
or so if time permits.
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