Remove collection prefix and default mongo URI (#1479)

* Remove collection prefix from DB Controller

* Remove collection prefix from cache

* Revert "Remove collection prefix from cache"

This reverts commit 529d67dd617b64c69c36a8a63382456e95edcab8.

* Remove knowledge of default mongo URI from Parse Server

* Remove adaptive collection paramater from deleteFields

* Tidy up DBAdapter.js

spec/DatabaseController.spec.js

@@ -6,11 +6,10 @@ let MongoStorageAdapter = require('../src/Adapters/Storage/Mongo/MongoStorageAda
 describe('DatabaseController', () => {
   it('can be constructed', done => {
     let adapter = new MongoStorageAdapter({
-      uri: 'mongodb://localhost:27017/test'
-    });
-    let databaseController = new DatabaseController(adapter, {
-      collectionPrefix: 'test_'
+      uri: 'mongodb://localhost:27017/test',
+      collectionPrefix: 'test_',
     });
+    let databaseController = new DatabaseController(adapter);
     databaseController.connect().then(done, error => {
       console.log('error', error.stack);
       fail();