Merge branch '3.4'

* 3.4:
  [Bridge\ProxyManager] Dont call __destruct() on non-instantiated services
  Consistently use 7 chars of sha256 for hash-based id generation
  Docblock improvement
  bumped Symfony version to 2.8.27
  updated VERSION for 2.8.26
  updated CHANGELOG for 2.8.26
  bumped Symfony version to 2.7.34
  updated VERSION for 2.7.33
  update CONTRIBUTORS for 2.7.33
  updated CHANGELOG for 2.7.33

Author: nicolas-grekas

Store/FlockStore.php

@@ -71,7 +71,7 @@ private function lock(Key $key, $blocking)
         $fileName = sprintf('%s/sf.%s.%s.lock',
             $this->lockPath,
             preg_replace('/[^a-z0-9\._-]+/i', '-', $key),
-            hash('sha256', $key)
+            strtr(substr(base64_encode(hash('sha256', $key, true)), 0, 7), '/', '_')
         );
 
         // Silence error reporting

Tests/Store/FlockStoreTest.php

@@ -62,8 +62,9 @@ public function testSaveSanitizeName()
         $key = new Key('<?php echo "% hello word ! %" ?>');
 
         $file = sprintf(
-            '%s/sf.-php-echo-hello-word-.4b3d9d0d27ddef3a78a64685dda3a963e478659a9e5240feaf7b4173a8f28d5f.lock',
-            sys_get_temp_dir()
+            '%s/sf.-php-echo-hello-word-.%s.lock',
+            sys_get_temp_dir(),
+            strtr(substr(base64_encode(hash('sha256', $key, true)), 0, 7), '/', '_')
         );
         // ensure the file does not exist before the store
         @unlink($file);