Move pub into sdk/lib/_internal.

utils/tests/pub/install/hosted/stay_locked_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 pub_tests;
-
-import 'dart:io';
-
-import 'package:pathos/path.dart' as path;
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../../../../pub/io.dart';
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('keeps a pub server package locked to the version in the '
-      'lockfile', () {
-    servePackages([packageMap("foo", "1.0.0")]);
-
-    d.appDir([dependencyMap("foo")]).create();
-
-    // This install should lock the foo dependency to version 1.0.0.
-    schedulePub(args: ['install'],
-        output: new RegExp(r"Dependencies installed!$"));
-
-    d.packagesDir({"foo": "1.0.0"}).validate();
-
-    // Delete the packages path to simulate a new checkout of the application.
-    schedule(() => deleteEntry(path.join(sandboxDir, packagesPath)));
-
-    // Start serving a newer package as well.
-    servePackages([packageMap("foo", "1.0.1")]);
-
-    // This install shouldn't update the foo dependency due to the lockfile.
-    schedulePub(args: ['install'],
-        output: new RegExp(r"Dependencies installed!$"));
-
-    d.packagesDir({"foo": "1.0.0"}).validate();
-  });
-}