Expand support for RPM distros

[zackproser]

Describe the solution you'd like Per this discussion, we need to develop an publicize a strategy for expanding support for distros such as Rocky Linux / AlmaLinux.

Note that this will involve:

1. Writing up a strategy and publishing it somewhere visible, either in the knowledge base, or on the docs site.
2. Extending bash-commons to be able to recognize any new distros we add support for. Currently this logic is in os.sh.
3. Adding regression tests throughout our modules to ensure that they behave correctly on the new distros. For example, in our ntp-module we actually only support Amazon linux, Ubuntu and CentOS.