Merge branch '2.8' into 3.0

* 2.8:
  [CS] Respect PSR2 4.2
  [Form] fix `empty_data` option in expanded `ChoiceType`
  [Console] removed unneeded private methods
  [Security] [Guard] Improve comment with working example
  sync min email validator version
  [TwigBridge] Fix inconsistency in LintCommand help
  explicitly forbid e-mail validator 2.0 or higher
  Fixed SymfonyQuestionHelper multi-choice with defaults
  [DoctrineBridge] Don't use object IDs in DoctrineChoiceLoader when passing a value closure
  Differentiate between the first time a progress bar is displayed and subsequent times
  finished previous commit
  No more exception for malformed input name
  fix post_max_size_message translation
  [Process] Fix pipes cleaning on Windows
  Avoid phpunit 5.4 warnings on getMock
  [Form] Add exception to FormRenderer about non-unique block names
  [Form] Consider a violation even if the form is not submitted

Author: fabpot

Resources/config/form.xml

@@ -183,5 +183,10 @@
         <service id="form.type_extension.submit.validator" class="Symfony\Component\Form\Extension\Validator\Type\SubmitTypeValidatorExtension">
             <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\SubmitType" />
         </service>
+        <service id="form.type_extension.upload.validator" class="Symfony\Component\Form\Extension\Validator\Type\UploadValidatorExtension">
+            <tag name="form.type_extension" alias="form" />
+            <argument type="service" id="translator"/>
+            <argument type="string">%validator.translation_domain%</argument>
+        </service>
     </services>
 </container>