[CI] test with 6.10 and 7.10, mongoDB 3.2 and 3.4 (#3787)

* Node modernization on CI

* Makes sure tests dont yeild unhandled promise rejections

* Adds small delay to startDB

* Adds mongodb service

* testing default

* stupid

* testing with silent nugget

* proper versions

* Single release step

spec/schemas.spec.js

@@ -5,7 +5,7 @@ var request = require('request');
 var dd = require('deep-diff');
 var Config = require('../src/Config');
 
-var config = new Config('test');
+var config;
 
 var hasAllPODobject = () => {
   var obj = new Parse.Object('HasAllPOD');
@@ -131,8 +131,11 @@ var masterKeyHeaders = {
 };
 
 describe('schemas', () => {
-
   beforeEach(() => {
+    config = new Config('test');
+  });
+
+  afterEach(() => {
     config.database.schemaCache.clear();
   });