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/support/CurrentSpecReporter.js

@@ -0,0 +1,15 @@
+// Sets a global variable to the current test spec
+// ex: global.currentSpec.description
+
+global.currentSpec = null;
+
+class CurrentSpecReporter {
+  specStarted(spec) {
+    global.currentSpec = spec;
+  }
+  specDone() {
+    global.currentSpec = null;
+  }
+}
+
+module.exports = CurrentSpecReporter;