benmosher / eslint-plugin-import / 3596

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Pull #1620

travis-ci

[Tests] add eslint-plugin-eslint-plugin internally and fix violations

This PR adds [eslint-plugin-eslint-plugin](https://github.com/not-an-aardvark/eslint-plugin-eslint-plugin) (a popular plugin for linting eslint plugins), enables relevant rules from it, and fixes violations.

The primary changes included are:
1. Adds missing rule schemas ([require-meta-schema](https://github.com/not-an-aardvark/eslint-plugin-eslint-plugin/blob/master/docs/rules/require-meta-schema.md)). Note that `schema: []` is added to enforce when a rule should have no schema.
2. Adds missing rule `type` property to `no-unused-modules` rule ([require-meta-type](https://github.com/not-an-aardvark/eslint-plugin-eslint-plugin/blob/master/docs/rules/require-meta-type.md)).
3. Removes duplicate test cases ([no-identical-tests](https://github.com/not-an-aardvark/eslint-plugin-eslint-plugin/blob/master/docs/rules/no-identical-tests.md)).

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