Reorganize some pub libraries.

sdk/lib/_internal/pub/lib/src/command_version.dart

Index: sdk/lib/_internal/pub/lib/src/command_version.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command_version.dart b/sdk/lib/_internal/pub/lib/src/command_version.dart
deleted file mode 100644
index 457eebd3f83a1ae79fd868f8d2168bf27909f3e8..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/lib/src/command_version.dart
+++ /dev/null
@@ -1,22 +0,0 @@
-// 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 command_version;
-
-import 'dart:async';
-
-import 'command.dart';
-import 'log.dart' as log;
-import 'sdk.dart' as sdk;
-
-/// Handles the `version` pub command. 
-class VersionCommand extends PubCommand {
-  String get description => 'Print pub version.';
-  String get usage => 'pub version';
-  bool get requiresEntrypoint => false;
-
-  Future onRun() {
-    log.message('Pub ${sdk.version}');
-  }
-}