Use standard ESLint disablings everywhere

Author: madarche

packages/convict/test/cli.test.js

@@ -1,5 +1,6 @@
 'use strict'
-/*eslint no-sync: 0*/
+
+/* eslint-disable no-sync */
 
 const fs = require('fs')
 const path = require('path')

packages/convict/test/lib/runner.js

@@ -1,11 +1,11 @@
 'use strict'
 
+/* eslint-disable no-process-exit */
+
 const path = require('path')
 
 const convict = require('../../src/main.js')
 
-/*eslint no-process-exit: 0*/
-
 process.on('message', function(spec) {
   try {
     const s = require(path.join(__dirname, '../cases', spec.spec))