Merge branch '5.0' into 5.1

* 5.0:
  [HttpClient] Support for cURL handler objects.
  [HttpClient] unset activity list when creating CurlResponse
  Fixed typo in test name
  add .body wrapper element
  [HttpFondation] Change file extension of "audio/mpeg" from "mpga" to "mp3"
  [VarDumper] Support for cURL handler objects.
  Check whether path is file in DataPart::fromPath()
  [DI][FrameworkBundle] Remove whitelist occurrences
  Avoid accessibility errors on debug toolbar
  update cookie test

Author: fabpot

Tests/Helper/QuestionHelperTest.php

@@ -801,7 +801,7 @@ public function testTraversableAutocomplete()
         $this->assertEquals('FooBundle', $dialog->ask($this->createStreamableInputInterfaceMock($inputStream), $this->createOutputInterface(), $question));
     }
 
-    public function testDisableSttby()
+    public function testDisableStty()
     {
         if (!Terminal::hasSttyAvailable()) {
             $this->markTestSkipped('`stty` is required to test autocomplete functionality');