Start running the analysis server integration tests by changing the name to end with _test.dart

pkg/analysis_server/test/integration/completion_domain_int_test.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.domain;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_testing/reflective_tests.dart';
@@ skipping 37 matching lines @@
   test_placeholder() {
     // The unit test framework freaks out if there are no tests, so this is a
     // placeholder until we have a passing test.
     // TODO(paulberry): remove this.
   }
 }
 
 main() {
   runReflectiveTests(CompletionDomainIntegrationTest);
 }