Merge branch '3.4' into 4.4

* 3.4:
  [FrameworkBundle] Fix session.attribute_bag service definition
  Update LdapBindAuthenticationProvider.php

Author: nicolas-grekas

Resources/config/session.xml

@@ -41,7 +41,8 @@
         <service id="Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface" alias="session.flash_bag" />
 
         <service id="session.attribute_bag" class="Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag">
-            <factory service="session" method="getAttributeBag"/>
+            <factory service="session" method="getBag"/>
+            <argument>attributes</argument>
         </service>
 
         <service id="session.storage.mock_file" class="Symfony\Component\HttpFoundation\Session\Storage\MockFileSessionStorage">