Update libosinfo examples
As the current libosinfo examples are not functional, please, let's update the examples in a way that we can have:
- At least C & Python codes doing exactly the same thing;
- Use the system's osinfo-db, so those reflect better what a user would need;
The question here is ... what would be interesting examples for the libosinfo consumers?
@berrange, @crobinso, @felipeborges, @pinotree ... opinions?