modify cache list command to show all versions of a package

sdk/lib/_internal/pub/test/pub_cache_test.dart

 // Copyright (c) 2013, 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_cache_test;
 
 import 'dart:io';
 import 'dart:json' as json;
 
 import 'package:scheduled_test/scheduled_test.dart';
@@ skipping 55 matching lines @@
             d.libDir("foo")
           ]),
           d.dir("bar-2.0.0", [
             d.libPubspec("bar", "2.0.0"),
             d.libDir("bar") ])
         ])
       ])
     ]).create();
 
     schedulePub(args: ['cache', 'list'], output:
-      new RegExp(r'\{"packages":\{"bar":\{"version":"2\.0\.0","location":'
-          r'"[^"]+bar-2\.0\.0"\},"foo":\{"version":"1\.2\.3","location":'
-          r'"[^"]+foo-1\.2\.3"\}\}\}$'));
+      new RegExp(r'\{"packages":\{"bar":\{"2\.0\.0":\{"location":'
+          r'"[^"]+bar-2\.0\.0"\}},"foo":\{"1\.2\.3":\{"location":'
+          r'"[^"]+foo-1\.2\.3"\}\}\}\}$'));
   });
 
   integration('includes packages containing deps with bad sources', () {
     // Set up a cache.
     d.dir(cachePath, [
       d.dir('hosted', [
          d.dir('pub.dartlang.org', [
           d.dir("foo-1.2.3", [
             d.libPubspec("foo", "1.2.3", deps: [{"bad": "bar"}]),
             d.libDir("foo")
           ])
         ])
       ])
     ]).create();
 
     schedulePub(args: ['cache', 'list'], output:
-      new RegExp(r'\{"packages":\{"foo":\{"version":"1\.2\.3","location":'
-          r'"[^"]+foo-1\.2\.3"\}\}\}$'));
+      new RegExp(r'\{"packages":\{"foo":\{"1\.2\.3":\{"location":'
+          r'"[^"]+foo-1\.2\.3"\}\}\}\}$'));
   });
 }