This is to avoid "unzip.zip" situations with some NICs:
those needing extended firmware package (which is hefty)
can at least install it by hand off the ISO.

*Maybe* a switch to use/firmware will appear reasonable
some day for this image either, don't know yet; this adds
firmware to installer itself (should only be needed if the
storage device used for rootfs *needs* firmware found in
that package as networking setup is omitted from JeOS
installer).