Relocate service library tests and hookup a working status file

runtime/observatory/tests/service/native_metrics_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=--compile-all --error_on_bad_type --error_on_bad_override --checked
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 
 import 'dart:profiler';
@@ skipping 26 matching lines @@
 (Isolate isolate) =>
     isolate.invokeRpc('getIsolateMetric',
                       { 'metricId': 'metrics/native/doesnotexist' })
           .then((DartError err) {
     expect(err is DartError, isTrue);
   }),
 
 ];
 
 main(args) => runIsolateTests(args, tests, testeeBefore: script);