Ubuntu preseed: Change the network and domain names

Change the default hostname and domain names to something
more palatable.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
unattended_install: Use fakeroot to remaster initrd

In order to install Ubuntu, we've been relying on cpio
directly. However, it needs root access for its operations.

So, in order to avoid failures when running as nonroot,
use fakeroot instead. This introduces a new dependency,
but hopefully it is not a huge one. And moreover, this
should only affect people looking to install Ubuntu or
Debian.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
guest support: Add Debian 6.0.7 x86_64

Introduce support to Debian 6.0.7 x86_64. I happened to
be working on a related subject, so I took the chance and
added support to it. It comes with a download asset file,
which means you can conveniently download it.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Guest support: Add Fedora 17 asset file

It's an older guest, but frequently useful for tests.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>