Reorganize mdv and observe packages

pkg/observe/test/utils.dart

Index: pkg/observe/test/utils.dart
diff --git a/pkg/mdv_observe/test/utils.dart b/pkg/observe/test/utils.dart
similarity index 71%
rename from pkg/mdv_observe/test/utils.dart
rename to pkg/observe/test/utils.dart
index 5dd5e381673d55e6cd54ea7ef59bbe3ff1bc9f76..dafedc167e96861cad53acea3e43818d64fd1140 100644
--- a/pkg/mdv_observe/test/utils.dart
+++ b/pkg/observe/test/utils.dart
@@ -2,11 +2,11 @@
 // 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 mdv_observe.test.utils;
+library observe.test.utils;
 
 import 'package:unittest/unittest.dart';
 
-// TODO(jmesserly): use matchers when this is supported. For now just
-// compare to toStrings.
+// TODO(jmesserly): use matchers when we have a way to compare ChangeRecords.
+// For now just use the toString.
 expectChanges(actual, expected, {reason}) =>
     expect('$actual', '$expected', reason: reason);