move tests to molecule 2.x

[paulfantom]

• allow grater control over CI process
• enable possibility of running multiple test scenarios (requested in Clarify supported Docker versions #46)
• better linter

[mongrelion]

This is looking good.
The only thing I have to add is that it's a good practice to not include in your code changes code that has been commented out. If it's not needed, better not to add it to the repo at all.

[paulfantom]

Those commented changes are for future support of more distros. I included those because they where included in molecule 1.x.