[WIP] Enable test suite to be randomized (#7265)

* initial run

* Update ParseGraphQLServer.spec.js

* temporarily enable reporter

* Bump retry limit

* fix undefined database

* try to catch error

* Handle LiveQueryServers

* Update Config.js

* fast-fail false

* Remove usage of AppCache

* oops

* Update contributing guide

* enable debugger, try network retry attempt 1

* Fix ldap unbinding

* move non specs to support

* add missing mock adapter

* fix Parse.Push

* RestController should match batch.spec.js

* Remove request attempt limit

* handle index.spec.js

* Update CHANGELOG.md

* Handle error: tuple concurrently updated

* test transactions

* Clear RedisCache after every test

* LoggerController.spec.js

* Update schemas.spec.js

* finally fix transactions

* fix geopoint deadlock

* transaction with clean database

* batch.spec.js

spec/PostgresInitOptions.spec.js

@@ -28,7 +28,7 @@ function createParseServer(options) {
   return new Promise((resolve, reject) => {
     const parseServer = new ParseServer.default(
       Object.assign({}, defaultConfiguration, options, {
-        serverURL: 'http://localhost:12666/parse',
+        serverURL: 'http://localhost:12668/parse',
         serverStartComplete: error => {
           if (error) {
             reject(error);
@@ -37,8 +37,8 @@ function createParseServer(options) {
             const app = express();
             app.use('/parse', parseServer.app);
 
-            const server = app.listen(12666);
-            Parse.serverURL = 'http://localhost:12666/parse';
+            const server = app.listen(12668);
+            Parse.serverURL = 'http://localhost:12668/parse';
             resolve(server);
           }
         },