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/schemas.spec.js

@@ -140,14 +140,13 @@ const masterKeyHeaders = {
 };
 
 describe('schemas', () => {
-  beforeEach(() => {
+  beforeEach(async () => {
+    await reconfigureServer();
     config = Config.get('test');
   });
 
   afterEach(async () => {
     await config.database.schemaCache.clear();
-    await TestUtils.destroyAllDataPermanently(false);
-    await config.database.adapter.performInitialization({ VolatileClassesSchemas: [] });
   });
 
   it('requires the master key to get all schemas', done => {