bug symfony#25038 [Cache] Memcached options should ignore "lazy" (nicolas-grekas)

This PR was merged into the 3.4 branch.

Discussion
----------

[Cache] Memcached options should ignore "lazy"

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#25036
| License       | MIT
| Doc PR        | -

Commits
-------

de5f41d [Cache] Memcached options should ignore "lazy"

Author: nicolas-grekas

src/Symfony/Component/Cache/Traits/MemcachedTrait.php

@@ -130,7 +130,7 @@ public static function createConnection($servers, array $options = array())
             }
 
             // set client's options
-            unset($options['persistent_id'], $options['username'], $options['password'], $options['weight']);
+            unset($options['persistent_id'], $options['username'], $options['password'], $options['weight'], $options['lazy']);
             $options = array_change_key_case($options, CASE_UPPER);
             $client->setOption(\Memcached::OPT_BINARY_PROTOCOL, true);
             $client->setOption(\Memcached::OPT_NO_BLOCK, true);