Fix linting issues

Author: pmuens

.eslintignore

@@ -1,3 +1,4 @@
 coverage
 node_modules
 tmp
+tmpdirs-serverless

lib/plugins/aws/deploy/tests/uploadArtifacts.js

@@ -1,7 +1,6 @@
 'use strict';
 
 const sinon = require('sinon');
-const os = require('os');
 const path = require('path');
 const BbPromise = require('bluebird');
 const expect = require('chai').expect;

tests/classes/Service.js

@@ -1,7 +1,6 @@
 'use strict';
 
 const path = require('path');
-const os = require('os');
 const YAML = require('js-yaml');
 const expect = require('chai').expect;
 const Service = require('../../lib/classes/Service');