Improved coding style as it is used in the DebOps project.

[ypid]

• Use YAML syntax which is better human readable.
• Try to use Ansible modules for operations when this is possible.
• template/dumpenv/dumpenv.j2 seems to be missing.

Thanks very much for your work :+1: I hope to be able to contribute some Qubes specific roles or the like in the near future.