Add support for module level Hiera data

[ardrigh]

I just tested PDK 1.3.2 to create a new module, and I noticed it doesn't add support for module level hiera data.

This is probably seen as a compatibility issue, since it's only supported with Puppet 4.9+ and PDK defaults to Puppet 4.7

A nice way to add this would be an additional question asking if the module level Hiera data support is wanted (not asking if "required"). Then set version based on a Yes/No answer given by the user.

Alternatively, a question could be added about supported Puppet versions. It could list 4.7.0 with global Hiera data, or > 4.9.0 with module level Hiera data support. Perhaps output a docs URL for people to find information, or include the docs URL in the help information.

Based off the choice made by the user, PDK could then create the data directory and update metadata.json with the "data_provider": "hiera" line.
Edit: Also create a basic hiera.yaml pointing to a stub data/common.yaml

This might be a good way to get more modules using this feature, and exposing Puppet module developers to the benefits it can provide.

[JacobHenner]

Should be implemented in conjunction with #246.

[ardrigh]

I totally overlooked that the data_provider key in metadata.json has been deprecated. That's one less thing to worry about 👍

[bmjen]

Thanks @ardrigh , https://tickets.puppetlabs.com/browse/PDK-908 was created to track this feature request.

[scotje]

This issue was moved to puppetlabs/pdk-planning#12