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

utils/tests/pub/real_version_test.dart

Index: utils/tests/pub/real_version_test.dart
diff --git a/utils/tests/pub/real_version_test.dart b/utils/tests/pub/real_version_test.dart
index 0d1882c56775dcdd1f39696b849b0a3e58ffc6fc..085de18aa6e15a5fcf2ee50f6b96dd7ff1e7ce74 100644
--- a/utils/tests/pub/real_version_test.dart
+++ b/utils/tests/pub/real_version_test.dart
@@ -7,8 +7,8 @@ library pub_tests;
 import 'dart:io';
 
 import 'test_pub.dart';
-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';
 
 main() {
   initConfig();