OBS: fix distro specific .dsc files
The old, simple way of just providing a .dsc file with a distro specific
name doesn't work anymore.
- switch .dsc format from 1.0 to 3.0 (quilt)
- remove Files: section from .dsc files
- add script to generate the .orig tar, .debian tar and update the .dsc
files with current length & MD5/SHA-1/SHA-256 checksums of those tar
files
After copying the latest OBS files and the latest tarball to the osc
working directory, you must run ./generate_debian.sh before committing
the changes to OBS.