Added requirements.yml files

[umeboshi2]

I am opening issue in debops to discuss this. BBS with link.

[umeboshi2]

debops/debops#140

[ypid]

Maybe a good idea to write small scripts for that stuff? Since doing something (added new roles) will get more complex the more files we need to update and so on.

[drybjed]

I'm adding roles manually, modification of requirements files isn't that big of an issue for me. And I guess the -testing requirements could be removed at some point, unless we find a use for multiple requirements files in a git repository, which I doubt.

[umeboshi2]

The requirements file can be shorter, since ansible-galaxy will also install dependencies defined in a role.