Relocate service library tests and hookup a working status file

runtime/observatory/test/caching_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
-
-// If caching is working properly, the coverage data will go into the same
-// Script object from which we requested coverage data, instead of a new
-// Script object.
-
-library caching_test;
-
-import 'package:observatory/service_io.dart';
-import 'package:unittest/unittest.dart';
-import 'test_helper.dart';
-
-script() {
-  print("This executed");
-}
-
-hasSomeCoverageData(Script script) {
-  for (var line in script.lines) {
-    if (line.hits != null) return true;
-  }
-  return false;
-}
-
-var tests = [
-(Isolate isolate) async {
-  Library lib = await isolate.rootLib.load();
-  Script script = await lib.scripts.single.load();
-  expect(hasSomeCoverageData(script), isFalse);
-  Script script2 = await script.refreshCoverage();
-  expect(identical(script, script2), isTrue);
-  expect(hasSomeCoverageData(script), isTrue);
-},
-
-];
-
-main(args) => runIsolateTests(args, tests, testeeBefore: script);