Reorganize some pub libraries.

sdk/lib/_internal/pub/lib/src/command/install.dart

Index: sdk/lib/_internal/pub/lib/src/command/install.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command_install.dart b/sdk/lib/_internal/pub/lib/src/command/install.dart
similarity index 87%
rename from sdk/lib/_internal/pub/lib/src/command_install.dart
rename to sdk/lib/_internal/pub/lib/src/command/install.dart
index afc9d2f88aefb84f902418cc95686853bab9d574..f5621de122e7b09a0b93a8eaa2ffbce94331f520 100644
--- a/sdk/lib/_internal/pub/lib/src/command_install.dart
+++ b/sdk/lib/_internal/pub/lib/src/command/install.dart
@@ -2,15 +2,15 @@
 // 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_install;
+library pub.command.install;
 
 import 'dart:async';
 
 import 'package:args/args.dart';
 
-import 'command.dart';
-import 'entrypoint.dart';
-import 'log.dart' as log;
+import '../command.dart';
+import '../entrypoint.dart';
+import '../log.dart' as log;
 
 /// Handles the `install` pub command.
 class InstallCommand extends PubCommand {