fillDiskWithDebs: Create fake start-stop-daemon.

This is needed in order to prevent services from starting while
populating the image with the contents of the .deb files. The procedure
used here is exactly the same as used in debootstrap.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
thttpd: New package, version 2.25b.

We already have mini_httpd, but IMHO it is *too* minimal as in not very
flexible in configuration (for example, I haven't found any runtime
configuration for disabling logging), so that's why I decided to add
thttpd, which serves quite well as an ad-hoc HTTPd.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
VM builds: Update debian Wheezy image to v7.1.

Wheezy has been released on June 15th and on all mirrors the SHA256 hash
of Packages.bz2 has changed to reflect the new release, so let's update.

Here is the release announcement from Debian:

http://www.debian.org/News/2013/20130615

It also seems that the versioning scheme has changed in version 7.x, so
they seem to have switched to a two digit versioning scheme. This means,
that the attribute name "debian70..." should really be something like
"debian7...", but I'm keeping the attribute as-is to not break
references.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>