Add a local packager config, so that react can find react-native when…

Summary:
The **motivation** for this PR is my sad colleague bestander: I managed to break travis with bd60d828c5, without considering the consequences. This PR solves this failure, and will fix it for good.

**Test plan (required)**

Travis will demonstrate that the code is solid.
Let’s make sure tests pass on both Travis and Circle CI.
Closes https://github.com/facebook/react-native/pull/8576

Differential Revision: D3516652

Pulled By: bestander

fbshipit-source-id: 09bb488517a0ee2b5b6219dfda559aef568bbbc2

rn-cli.config.js

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+'use strict';
+
+/**
+ * This cli config is needed for development purposes, e.g. for running
+ * integration tests during local development or on CI services.
+ */
+module.exports = {
+  extraNodeModules: {
+    'react-native': __dirname,
+  },
+};