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/HTTPRequest.spec.js

@@ -39,8 +39,12 @@ function startServer(done) {
 
 describe('httpRequest', () => {
   let server;
-  beforeAll(done => {
-    server = startServer(done);
+  beforeEach(done => {
+    if (!server) {
+      server = startServer(done);
+    } else {
+      done();
+    }
   });
 
   afterAll(done => {