Merge branch '2.7' into 2.8

* 2.7:
  [Yaml] throw a ParseException on invalid data type
  [TwigBridge] type-dependent path discovery
  Resources as string have the same problem
  Introduce failing test case when a SplFileInfo object is passed to the extract() method in the TwigExtractor.
  #15331 add infos about deprecated classes to UPGRADE-3.0
  [Asset] removed unused private property.
  [Security] removed useless else condition in SwitchUserListener class.
  [travis] Tests deps=low with PHP 5.6
  [Console] Fix console output with closed stdout

Author: fabpot

Http/Firewall/SwitchUserListener.php

@@ -115,9 +115,9 @@ private function attemptSwitchUser(Request $request)
         if (false !== $originalToken) {
             if ($token->getUsername() === $request->get($this->usernameParameter)) {
                 return $token;
-            } else {
-                throw new \LogicException(sprintf('You are already switched to "%s" user.', $token->getUsername()));
             }
+
+            throw new \LogicException(sprintf('You are already switched to "%s" user.', $token->getUsername()));
         }
 
         if (false === $this->accessDecisionManager->decide($token, array($this->role))) {