title: Can not access other dbs for user who created as "userAdminAnyDatabase" role
body: <p>In mongo 2.4.x, it supports a new way to <a href="http://docs.mongodb.org/manual/tutorial/add-user-administrator/" rel="noreferrer">create user in admin database</a>,
  I thought the user created with <strong>userAdminAnyDatabase</strong> role should be able to access all other database right?</p>
  
  <pre><code>db.addUser({user:"u", pwd:"p", roles:["userAdminAnyDatabase"]})
  </code></pre>
  
  <p>However, it cant do this follow the doc. </p>
  
  <p>When I created a users in the 2.2.x style, It works. </p>
  
  <pre><code>db.addUser("u","p")
  </code></pre>
  
  <p>My question is had I mistaken the operations? If I want to create a user who can access all dbs using the 2.4.x syntax, what't the correct way? Any other options needed?</p>
  
  <p>Thanks.</p>
  
  <p>Here is the details shell code:</p>
  
  <pre><code>➜  mgo ✗ mongo
  MongoDB shell version: 2.4.5
  connecting to: test
  &gt; use admin
  switched to db admin
  &gt; db.addUser({user: "u", pwd: "p", roles:["userAdminAnyDatabase"]})
  {
      "user" : "u",
      "pwd" : "d4198ee555320fa5c048da6d6da440d8",
      "roles" : [
          "userAdminAnyDatabase"
      ],
      "_id" : ObjectId("51dc20f0282f72950455b62e")
  }
  &gt; db.auth(
  Display all 170 possibilities? (y or n)
  &gt; db.auth("u","p")
  1
  &gt; ^C
  bye
  ➜  mgo ✗ mongo admin -u u -p p
  MongoDB shell version: 2.4.5
  connecting to: admin
  &gt; show dbs
  Tue Jul  9 22:44:47.959 JavaScript execution failed: listDatabases failed:{ "ok" : 0, "errmsg" : "unauthorized" } at src/mongo/shell/mongo.js:L46
  &gt; use admin
  switched to db admin
  &gt; db.addUser("uncle", "peter")
  {
      "user" : "uncle",
      "readOnly" : false,
      "pwd" : "e42842e07c4fc324e9724d6aa41f6411",
      "_id" : ObjectId("51dc22456642fa58413adffc")
  }
  &gt; db.auth("uncle", "peter")
  1
  &gt; ^C
  bye
  ➜  mgo ✗ mongo admin -u uncle -p peter
  MongoDB shell version: 2.4.5
  connecting to: admin
  &gt; show dbs
  admi    (empty)
  admin   0.203125GB
  local   0.078125GB
  qortex_global   0.203125GB
  qortexprod  0.203125GB
  test    (empty)
  &gt;
  </code></pre>