Merge branch '4.4'

* 4.4: (33 commits)
  [DI] fix processing of regular parameter bags by MergeExtensionConfigurationPass
  [FrameworkBundle] reset cache pools between requests
  [HttpFoundation] Accept must take the lead for Request::getPreferredFormat()
  [FrameworkBundle] Allow to use the BrowserKit assertions with Panther and API Platform's test client
  Use ConnectionRegistry instead of RegistryInterface.
  Fixes windows error
  Improving the request/response format autodetection
  [Messager] Simplified MessageBus::__construct()
  [WIP][Mailer] Overwrite envelope sender and recipients from config
  [Messenger] Added more test for MessageBus
  [Mime] Updated some PHPDoc contents
  [PropertyAccess] Adds entries to CHANGELOG and UPGRADE
  fixed typo
  [FrameworkBundle] Simplified some code in the DI configuration
  [Filesystem] added missing deprecations to UPGRADE-4.3.md
  [Filesystem] depreacte calling isAbsolutePath with a null
  Fix authentication for redis transport
  only decorate when an event dispatcher was passed
  [Messenger] Added support for auto trimming of redis streams
  [FrmaeworkBundle] More simplifications in the DI configuration
  ...

Compiler/AnalyzeServiceReferencesPass.php

@@ -34,7 +34,6 @@ class AnalyzeServiceReferencesPass extends AbstractRecursivePass
     private $onlyConstructorArguments;
     private $hasProxyDumper;
     private $lazy;
-    private $expressionLanguage;
     private $byConstructor;
     private $definitions;
     private $aliases;

Compiler/MergeExtensionConfigurationPass.php

@@ -200,6 +200,10 @@ public function resolveEnvPlaceholders($value, $format = null, array &$usedEnvs
         $bag = $this->getParameterBag();
         $value = $bag->resolveValue($value);
 
+        if (!$bag instanceof EnvPlaceholderParameterBag) {
+            return parent::resolveEnvPlaceholders($value, $format, $usedEnvs);
+        }
+
         foreach ($bag->getEnvPlaceholders() as $env => $placeholders) {
             if (false === strpos($env, ':')) {
                 continue;

Compiler/ServiceReferenceGraphNode.php

@@ -81,7 +81,7 @@ public function getId()
     /**
      * Returns the in edges.
      *
-     * @return array The in ServiceReferenceGraphEdge array
+     * @return ServiceReferenceGraphEdge[]
      */
     public function getInEdges()
     {
@@ -91,7 +91,7 @@ public function getInEdges()
     /**
      * Returns the out edges.
      *
-     * @return array The out ServiceReferenceGraphEdge array
+     * @return ServiceReferenceGraphEdge[]
      */
     public function getOutEdges()
     {