Update Debian packaging for 0.9

This merges 0.9 into the debian branch. I simplified the rules file using dh 9 sequences. The hack to fix #422655 to avoid leftover .pyc files is no longer necessary, confirmed using piuparts.

The last patch removes the debian specific jail.conf and uses the upstream file as paths are now defined in distro-specific files. (Don't know if it needs some adjustments).