mochajs / mocha / 4390

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fix ESLint problems and consolidate configuration

- we weren't being strict enough about disallowing ES6.  even though we
  had `es6: false` in the config, the `parserOptions` were set to use
  `ecmaVersion: 8`.  oops
- linted a couple files
- deleted all `.eslintrc.yml` files except for the root one; use `overrides`
  instead

Signed-off-by: Christopher Hiller <boneskull@boneskull.com>

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