Merge branch '2.8'

* 2.8:
  [PhpUnit] Auto-register SymfonyTestsListener
  [phpunit] Upgrade when a change is detected and when install subcommand is used
  [Filesystem] Fix test on Windows
  Fix merge
  [HttpFoundation] Extend ClockMock to session storage tests
  [Process] Don't use @requires on abstract class
  [VarDumper] Fix wordwrap with Bootstrap
  Fix the BC layer for the key->secret renaming for remember_me
  Fix potential access to undefined index

Conflicts:
	src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php
	src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/LegacyPdoSessionHandlerTest.php
	src/Symfony/Component/Locale/phpunit.xml.dist

Author: nicolas-grekas

phpunit.xml.dist

@@ -25,8 +25,4 @@
             </exclude>
         </whitelist>
     </filter>
-
-    <listeners>
-        <listener class="Symfony\Bridge\PhpUnit\SkippedTestsListener" />
-    </listeners>
 </phpunit>