This update for mkdud fixes the following issues:

version 2.6:
- merge gh#openSUSE/mkdud#49
- fix "How to apply" report
- minor spec file adjustments

version 2.5:
- merge gh#openSUSE/mkdud#48
- align with latest Agama adjustment and support Slowroll
  (boo#1261030)
- adapt to also work with xorriso (boo#1260860)
- simplify spec file
- update documentation

version 2.4:
- merge gh#openSUSE/mkdud#47
- de-duplicate files to reduce size (boo#1258149)
- update dist handling to match our official product naming more
  closely
- update supported architecture list

version 2.3:
- merge gh#openSUSE/mkdud#46
- make dependence on osc package optional (boo#1254110)