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

utils/tests/pub/io_test.dart

Index: utils/tests/pub/io_test.dart
diff --git a/utils/tests/pub/io_test.dart b/utils/tests/pub/io_test.dart
index 2ebf55c47454e5563e546fa803fe7b670d5da15a..585d068b2e1127db5bd4e7a70c0ee8cc01ebd786 100644
--- a/utils/tests/pub/io_test.dart
+++ b/utils/tests/pub/io_test.dart
@@ -6,8 +6,8 @@ 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';