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

utils/tests/pub/install/git/lock_version_test.dart

Index: utils/tests/pub/install/git/lock_version_test.dart
diff --git a/utils/tests/pub/install/git/lock_version_test.dart b/utils/tests/pub/install/git/lock_version_test.dart
index 7c3824b7f62951a349bf9d4e786c07e14ad558c4..2e498b3024f7b5da8002ae77d6cb342f4943c701 100644
--- a/utils/tests/pub/install/git/lock_version_test.dart
+++ b/utils/tests/pub/install/git/lock_version_test.dart
@@ -6,8 +6,8 @@ library pub_tests;
 
 import 'dart:io';
 
-import '../../../../../pkg/pathos/lib/path.dart' as path;
-import '../../../../../pkg/scheduled_test/lib/scheduled_test.dart';
+import 'package:pathos/path.dart' as path;
+import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../../../pub/io.dart';
 import '../../descriptor.dart' as d;