* 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.
* Load vars and tasks by OS family instaed of package manager. Fix Dockerfile for CentOS 8.
* Config for CentOS 8 and others
* Make monthly repo checking the default