Add support for stage definition in provider object

Author: pmuens

shared/utils.js

@@ -5,7 +5,7 @@ const BbPromise = require('bluebird');
 
 module.exports = {
   setDefaults() {
-    this.options.stage = _.get(this, 'options.stage') || 'dev';
+    this.options.stage = _.get(this, 'options.stage') || _.get(this, 'serverless.service.provider.stage') || 'dev';
     this.options.runtime = _.get(this, 'options.runtime') || 'nodejs8';
 
     // serverless framework is hard-coding us-east-1 region from aws

shared/utils.test.js

@@ -43,10 +43,12 @@ describe('Utils', () => {
     it('should set the provider values for stage and region if provided', () => {
       googleCommand.serverless.service.provider = {
         region: 'my-region',
+        stage: 'my-stage',
       };
 
       return googleCommand.setDefaults().then(() => {
         expect(googleCommand.options.region).toEqual('my-region');
+        expect(googleCommand.options.stage).toEqual('my-stage');
       });
     });