* Move common Python packages to main.yml, install dependent Python packages first.
Remove Fedora 31 as it's EOL and use the borgbackup, borgmatic and cython packages from Fedora's repositories.
* Add specific package lists for Fedora. The python packages have been renamed in Fedora 32 (python3-* -> python-*). To further support Fedora 31, the RedHat vars have been copied for this case. * Enable molecule tests for Fedora.
