Merge branch '2.8' into 3.3

* 2.8:
  Update JsonBundleReader.php
  [HttpKernel] Clean test directory on tear down
  Fix testHtml method with regexp

Author: nicolas-grekas

Tests/CrawlerTest.php

@@ -397,7 +397,7 @@ public function testText()
     public function testHtml()
     {
         $this->assertEquals('<img alt="Bar">', $this->createTestCrawler()->filterXPath('//a[5]')->html());
-        $this->assertEquals('<input type="text" value="TextValue" name="TextName"><input type="submit" value="FooValue" name="FooName" id="FooId"><input type="button" value="BarValue" name="BarName" id="BarId"><button value="ButtonValue" name="ButtonName" id="ButtonId"></button>', trim($this->createTestCrawler()->filterXPath('//form[@id="FooFormId"]')->html()));
+        $this->assertEquals('<input type="text" value="TextValue" name="TextName"><input type="submit" value="FooValue" name="FooName" id="FooId"><input type="button" value="BarValue" name="BarName" id="BarId"><button value="ButtonValue" name="ButtonName" id="ButtonId"></button>', trim(preg_replace('~>\s+<~', '><', $this->createTestCrawler()->filterXPath('//form[@id="FooFormId"]')->html())));
 
         try {
             $this->createTestCrawler()->filterXPath('//ol')->html();