Move file_system libraries into 'analyzer'.

pkg/analyzer/test/file_system/test_all.dart

 // Copyright (c) 2014, 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.
 
+library test.file_system;
+
 import 'package:unittest/unittest.dart';
 
+import 'memory_file_system_test.dart' as memory_file_system_test;
+import 'resource_uri_resolver_test.dart' as resource_uri_resolver_test;
+
+
 /// Utility for manually running all tests.
 main() {
-//  group('analysis_services', () {
-//  });
+  groupSep = ' | ';
+  group('file_system', () {
+    memory_file_system_test.main();
+    resource_uri_resolver_test.main();
+  });
 }