Refactor service tests in preparation of running on sky_shell

runtime/observatory/tests/service/logging_test.dart

 // Copyright (c) 2015, 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 'dart:developer' as developer;
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'package:logging/logging.dart';
-
+import 'service_test_common.dart';
 import 'test_helper.dart';
 
 void init() {
   Logger.root.level = Level.ALL;
   Logger.root.onRecord.listen((logRecord) {
     developer.log(
         logRecord.message,
         time: logRecord.time,
         sequenceNumber: logRecord.sequenceNumber,
         level: logRecord.level.value,
@@ skipping 27 matching lines @@
     expect(event.logRecord['level'], equals(Level.INFO));
     expect(event.logRecord['message'].valueAsString, equals('YES'));
     expect(event.logRecord['time'], new isInstanceOf<DateTime>());
   }),
 ];
 
 main(args) => runIsolateTests(args,
                               tests,
                               testeeBefore: init,
                               testeeConcurrent: run);