Switch pkg packages, pub, and dartdoc to use package: imports.

utils/tests/pub/io_test.dart

 // Copyright (c) 2012, 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.
 
 library io_test;
 
 import 'dart:io';
 
-import '../../../pkg/pathos/lib/path.dart' as path;
-import '../../../pkg/unittest/lib/unittest.dart';
+import 'package:pathos/path.dart' as path;
+import 'package:unittest/unittest.dart';
 
 import '../../pub/io.dart';
 import '../../pub/utils.dart';
 import 'test_pub.dart';
 
 main() {
   initConfig();
 
   group('listDir', () {
     test('lists a simple directory non-recursively', () {
@@ skipping 261 matching lines @@
           return createSymlink(targetPath, symlink1Path)
               .then((_) => createSymlink(symlink1Path, symlink2Path))
               .then((_) {
             expect(predicate(symlink2Path), equals(forMultiLevelFileSymlink));
           });
         }), completes);
       });
     }
   });
 }