Merge branch '3.4' into 4.0

* 3.4:
  do not mock the session in token storage tests
  [DependencyInjection] resolve array env vars
  Add Occitan plural rule
  Fix security/* cross-dependencies
  [Lock] Skip test if posix extension is not installed
  [DI] Allow defining bindings on ChildDefinition
  use strict compare in url validator
  Disallow illegal characters like "." in session.name
  [HttpKernel] do file_exists() check instead of silent notice
  fix rounding from string

Author: fabpot

Constraints/UrlValidator.php

@@ -86,7 +86,7 @@ public function validate($value, Constraint $constraint)
                 Url::CHECK_DNS_TYPE_SOA,
                 Url::CHECK_DNS_TYPE_SRV,
                 Url::CHECK_DNS_TYPE_TXT,
-            ))) {
+            ), true)) {
                 throw new InvalidOptionsException(sprintf('Invalid value for option "checkDNS" in constraint %s', get_class($constraint)), array('checkDNS'));
             }