Allow single server instance in test suite (#7262)

* initial pass

* reconfigureServer when needed

* finish postgres tests

* mongo tests

* more tests

* clean up

* re-add skipped test

* Fix transaction tests

* handle batch

* AuthenticationAdapter fix

* More reconfiguration

* clean up

* properly terminate cli servers

* handle Parse.Push

* Flaky PushController

* ensure reconfigureServer when changed

* fix postgres tests

* remove console.log

* LiveQuery spec remove duplicates and listeners

spec/UserPII.spec.js

@@ -13,6 +13,7 @@ describe('Personally Identifiable Information', () => {
   let user;
 
   beforeEach(async done => {
+    await reconfigureServer();
     user = await Parse.User.signUp('tester', 'abc');
     user = await Parse.User.logIn(user.get('username'), 'abc');
     await user.set('email', EMAIL).set('zip', ZIP).set('ssn', SSN).save();