[buildd-tools-devel] Filesystem union v2

[Jan-Marek Glogowski]

Hi everybody

This is the stripped down version of the filesystem union patchset I have
sent about two months ago.

   8.1% etc/setup.d/
  62.9% sbuild/
  25.8% test/

 39 files changed, 1498 insertions(+), 228 deletions(-)

It includes patches for all chroot types, but I just tested directory and
loopback chroots.

Thanks for review and testing.

Jan-Marek Glogowski