Move PackageIndexAssembler into analysis_server.

pkg/analysis_server/test/services/index/test_all.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
 import 'index_test.dart' as index_test;
+import 'index_unit_test.dart' as index_unit_test;
 
 /**
  * Utility for manually running all tests.
  */
 main() {
   initializeTestEnvironment();
   group('index', () {
     index_test.main();
+    index_unit_test.main();
   });
 }