Revert "Add no-use-before-define linter rule"

This reverts commit fdcc5d68a2.

Unfortunately, this requires us to move exports to the bottom.
This in turn causes circular dep issues and also access of
exports.GLOBAL_VAR in the global context

src/dns.js

@@ -1,6 +1,6 @@
 'use strict';
 
-module.exports = exports = {
+exports = module.exports = {
     fqdn,
     getName,