Split "_Driver" tests to separate test files.

pkg/analysis_server/test/integration/completion/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.integration.completion.all;
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
+import 'get_suggestions_driver_test.dart' as get_suggestions_driver_test;
 import 'get_suggestions_test.dart' as get_suggestions_test;
 
 /**
  * Utility for manually running all integration tests.
  */
 main() {
   defineReflectiveSuite(() {
+    get_suggestions_driver_test.main();
     get_suggestions_test.main();
   }, name: 'completion');
 }