Use "package:" imports for pub.

test/lish/does_not_publish_if_private_with_server_arg_test.dart

Index: test/lish/does_not_publish_if_private_with_server_arg_test.dart
diff --git a/test/lish/does_not_publish_if_private_with_server_arg_test.dart b/test/lish/does_not_publish_if_private_with_server_arg_test.dart
index 989d50643ae52cee83a65186e561440d979352c4..12dbe68244038ea6b7e1c0dfdf35c72da1336af2 100644
--- a/test/lish/does_not_publish_if_private_with_server_arg_test.dart
+++ b/test/lish/does_not_publish_if_private_with_server_arg_test.dart
@@ -2,9 +2,9 @@
 // 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.
 
+import 'package:pub/src/exit_codes.dart' as exit_codes;
 import 'package:scheduled_test/scheduled_test.dart';
 
-import '../../lib/src/exit_codes.dart' as exit_codes;
 import '../descriptor.dart' as d;
 import '../test_pub.dart';