Remove react-packager indirection.

Summary:
This moves the `src` directory one level up and removes the `react-packager` folder. Personally, I always disliked this indirection. I'm reorganizing some things in RNP, so this seems to make sense.

Not sure if I forgot to update any paths. Can anyone advice if there are more places that need change?

Reviewed By: jeanlauliac

Differential Revision: D4487867

fbshipit-source-id: d63f9c79d6238300df9632d2e6a4e6a4196d5ccb

packager/src/ModuleGraph/test-helpers.js

@@ -0,0 +1,23 @@
+/**
+ * Copyright (c) 2016-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';
+
+const generate = require('babel-generator').default;
+const stub = require('sinon/lib/sinon/stub');
+
+exports.fn = () => {
+  const s = stub();
+  const f = jest.fn(s);
+  f.stub = s;
+  return f;
+};
+
+const generateOptions = {concise: true};
+exports.codeFromAst = ast => generate(ast, generateOptions).code;
+exports.comparableCode = code => code.trim().replace(/\s\s+/g, ' ');