Merge branch '2.7' into 2.8

* 2.7:
  [Config] Handle nullable node name + fix inheritdocs
  [Security] added userChecker to SimpleAuthenticationProvider
  [Debug] fix test
  Fix typo in test method name
  Fixes #26563 (open_basedir restriction in effect)
  [Debug] Reset previous exception handler ealier to prevent infinite loop
  add hint in Github pull request template
  [Validator] Fix docblock of ClassMetadata#members
  [BrowserKit] Fix cookie path handling when $domain is null
  [DoctrineBridge] Don't rely on ClassMetadataInfo->hasField in DoctrineOrmTypeGuesser anymore
  [BrowserKit] Improves CookieJar::get
  [BrowserKit] Fix Cookie's PHPDoc
  [DomCrawler] Change bad wording in ChoiceFormField::untick
  [DomCrawler] Fix the PHPDoc of ChoiceFormField::setValue
  [DomCrawler] Avoid a useless call to strtolower
  [FrameworkBundle] HttpCache is not longer abstract
  [DomCrawler] extract(): fix a bug when the attribute list is empty
  [Config] Backport string|null api for node names

Author: nicolas-grekas

HttpCache/HttpCache.php

@@ -11,7 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\HttpCache;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\HttpKernel\HttpCache\HttpCache as BaseHttpCache;
 use Symfony\Component\HttpKernel\HttpCache\Esi;
 use Symfony\Component\HttpKernel\HttpCache\Store;
@@ -23,16 +23,16 @@
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-abstract class HttpCache extends BaseHttpCache
+class HttpCache extends BaseHttpCache
 {
     protected $cacheDir;
     protected $kernel;
 
     /**
-     * @param HttpKernelInterface $kernel   An HttpKernelInterface instance
-     * @param string              $cacheDir The cache directory (default used if null)
+     * @param KernelInterface $kernel   A KernelInterface instance
+     * @param string          $cacheDir The cache directory (default used if null)
      */
-    public function __construct(HttpKernelInterface $kernel, $cacheDir = null)
+    public function __construct(KernelInterface $kernel, $cacheDir = null)
     {
         $this->kernel = $kernel;
         $this->cacheDir = $cacheDir;