Refactor service tests in preparation of running on sky_shell

runtime/observatory/tests/service/isolate_lifecycle_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.
 // VMOptions=--error_on_bad_type --error_on_bad_override
 
 import 'dart:async';
 import 'dart:developer';
 import 'dart:isolate' as I;
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
-
+import 'service_test_common.dart';
 import 'test_helper.dart';
 
 final spawnCount = 4;
 final resumeCount = spawnCount ~/ 2;
 final isolates = [];
 
 void spawnEntry(int i) {
 }
 
 Future during() async {
@@ skipping 101 matching lines @@
         await isolate.resume();
       } catch(_) {}
       if (resumesIssued == resumeCount) {
         break;
       }
     }
     await completer.future;
   },
 
   (VM vm) async {
-    expect(numPaused(vm), spawnCount + 1 - resumeCount); 
+    expect(numPaused(vm), spawnCount + 1 - resumeCount);
   },
 ];
 
 main(args) async => runVMTests(args, tests,
                                testeeConcurrent: during,
                                pause_on_exit: true);