Kafo

Puppet 4's DSL supports more complex data types in an aim to obsolete the use of validation functions and provide earlier indication of invalid data, which matches what Kafo's trying to do by calling validations itself.

Using puppet-strings (#7848) will let us extract the signature (the data type, e.g. Array[String]) where specified, which could be stored in the existing 'type' data returned from kafo_parsers to kafo. Existing string/int/bool etc. Kafo data types could later be converted into the Puppet 4 types trivially.