Decide on (and convert to) indentation style

[CFSworks]

Some Python files in the repository are in two-spaces-per-level indentation, while PEP-8 (and Ansible as a whole) uses four-spaces-per-level. Which style should be used for this repository?

[senorsmile]

I was complaining about this exact same problem literally hours ago.

[zahodi]

I personally prefer two-spaces indentation. Didn't really think about Ansible code as a whole which will probably matter if we try to bring it to the core.

[senorsmile]

Since our ultimate goal is to get this in upstream Ansible, we'll want to follow whatever their style guide is.