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

pkg/analysis_server/test/integration/analysis_error_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.analysis.error;
 
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart';
 
 import 'integration_tests.dart';
@@ skipping 15 matching lines @@
       expect(errors, hasLength(1));
       expect(errors[0], isAnalysisError);
       expect(errors[0]['location']['file'], equals(filePath));
     });
   }
 }
 
 main() {
   runReflectiveTests(AnalysisErrorIntegrationTest);
 }