fai package splitting

[Henning Sprang]

Hi, 

I found another one:

fai-cd needs mkisofs, it is neither mentioned in the Depends for the
quickstart package nor in the Recommends/Suggests for fai-server.

Probably fai-cd also doesn't check for the availability of mkisofs at
the start and only fails at the end when trying to use it. I'll check
that and write a wishlist bug about that, because that's a code change
while the above is package metadata.

Henning