Deprecation: Legacy HWRP mixins (CHEF-23)

In Chef Infra Client 14 several legacy mixins will be removed. Usage of these mixins has resulted in deprecation warnings for several years. They were traditionally used in some HWRPs.

The Cookstyle cop ChefDeprecations/UsesDeprecatedMixins has been introduced to detect these mixins:

• Chef::Mixin::LanguageIncludeAttribute
• Chef::Mixin::RecipeDefinitionDSLCore
• Chef::Mixin::LanguageIncludeRecipe
• Chef::Mixin::Language
• Chef::DSL::Recipe::FullDSL