puppetlabs / pdk / 3139

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master: 92%

Pull #841

travis-ci

(PDK-1608) Implement system-level settings for PDK configuration

Previously only per-user settings existed for the PDK::Config classes.  This
commit:
* Adds the concept and file locations for system level settings
* Adds helper methods to PDK::Config to make it easier to query multilevel
  settings, and to query using precedence
* Makes it easier to eventually add per-project settings
* Adds tests for the new methods

Note that the various PDK Modules and Classes still won't consume system-level
settings until they use the `PDK.config.pdk_setting(...` method.  Currently they
still use `PDK.config.user[...`.  This will changed in later commits.

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