[cache] Bump RedisAdapter timeout to 5s

Bump RedisAdapter timeout to 5s because (at least with Predis) 0 means 0s

src/Symfony/Component/Cache/Adapter/RedisAdapter.php

@@ -25,8 +25,8 @@ class RedisAdapter extends AbstractAdapter
     private static $defaultConnectionOptions = array(
         'class' => null,
         'persistent' => 0,
-        'timeout' => 0,
-        'read_timeout' => 0,
+        'timeout' => 30,
+        'read_timeout' => 30,
         'retry_interval' => 0,
     );
     private $redis;