Recommended update for mkdud
This update for mkdud fixes the following issues:
- Add support for leap and tumbleweed
- Remove warning on yast replacement for versions supporting it.
- Better public key file detection
- Added --obs-keys option to retrieve necessary obs project keys
- Use mkpath instead of make_path to be compatible with older perl versions
- Suppport adding public pgp keys for rpm verification
- Submitted by Steffen Winterfeldt (snwint)