Add hiera_data to the cache key, for hiera-puppet-helper #488
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As mentioned in #215, we make hiera_config a part of the catalogue cache key, but not hiera_data (which is used by the popular rspec-hiera-puppet/hiera-puppet-helper gem) which can cause problems as users might get a cached catalogue even though they've supplied different hiera data.
This PR adds hiera_data (if provided with
let
) to the cache key to prevent this from happening.Closes #215