Commits on Dec 17, 2016

1. config: smarter provider alias usage validation …

   Fixes #4789
   
   This improves the validation that valid provider aliases are used.
   
   Previously, we required that provider aliases be defined in every module
   they're used. This isn't correct because the alias may be used in a
   parent module and inherited.
   
   This removes that validation and creates the validation that a provider
   alias must be defined in the used module or _any parent_. This allows
   inheritance to work properly.
   
   We've always had this type of validation for aliases because we believe
   its a good UX tradeoff: typo-ing an alias is really painful, so we
   require declaration of alias usage. It may add a small burden to
   declare, but since relatively few aliases are used, it improves the
   scenario where a user fat-fingers an alias name.

   

   mitchellh committed Dec 17, 2016
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