tools: alphabetize eslint stylistic issues section

Rearrange the style rules in .eslintrc to be in alphabetical order.

This has two benefits:

It means the rules appear in the same order as they do in the ESLint
documentation, easing cross-referencing.

It also means that it is much easier to determine with visual inspection
if a rule is set or not.

https://github.com/nodejs/node/pull/5135


Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>