Flatten features directory tree

features/recipe_target.feature

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+Feature: `target' recipe keyword
+
+  Scenario: registers the target host on which tasks should be applied
+    Given a recipe with:
+      """
+      target 'some_host.example'
+
+      puts env.target
+      """
+    When I successfully execute the recipe
+    Then the output must contain exactly "some_host.example\n"