* alternatives: Fix bug with priority default
If neigther the priority nor the subcommands where specified the module decided to update the priority with the default value anyway. This resulted in bug #4803 and #4804
* Add changelog fragment.
* Distinguish None from 0.
* Address review comments.
* Update plugins/modules/system/alternatives.py
Co-authored-by: Pilou <pierre-louis@libregerbil.fr>
* Remove unrelated issues from changelog.
Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Pilou <pierre-louis@libregerbil.fr>
