Merge branch '4.3' into 4.4

* 4.3:
  fixed CS
  fixed CS
  fixed CS
  Do not log or call the proxy function when the locale is the same
  Added missing required dependencies on psr/cache and psr/container in symfony/cache-contracts and symfony/service-contracts respectively.
  [HttpClient] fix closing debug stream prematurely
  [Mailer] made code more robust
  Restore compatibility with php 5.5
  fixed sender/recipients in SMTP Envelope
  collect called listeners information only once
  [HttpKernel] Remove TestEventDispatcher.

Author: fabpot

Dotenv.php

@@ -401,7 +401,7 @@ private function resolveCommands($value)
                 throw new \LogicException('Resolving commands requires the Symfony Process component.');
             }
 
-            $process = \method_exists(Process::class, 'fromShellCommandline') ? Process::fromShellCommandline('echo '.$matches[0]) : new Process('echo '.$matches[0]);
+            $process = method_exists(Process::class, 'fromShellCommandline') ? Process::fromShellCommandline('echo '.$matches[0]) : new Process('echo '.$matches[0]);
             $process->inheritEnvironmentVariables(true);
             $process->setEnv($this->values);
             try {