Merge branch '2.7' into 2.8

* 2.7:
  [SecurityBundle] Fix syntax error in test
  [Console] Remove remaining dead code
  bumped Symfony version to 2.7.39
  updated VERSION for 2.7.38
  updated CHANGELOG for 2.7.38
  Replace array|\Traversable by iterable
  Fix ambiguous pattern

Author: nicolas-grekas

Constraints/UrlValidator.php

@@ -25,7 +25,7 @@ class UrlValidator extends ConstraintValidator
             (%s)://                                 # protocol
             (([\.\pL\pN-]+:)?([\.\pL\pN-]+)@)?      # basic auth
             (
-                ([\pL\pN\pS-\.])+(\.?([\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
+                ([\pL\pN\pS\-\.])+(\.?([\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
                     |                                                 # or
                 \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}                    # an IP address
                     |                                                 # or

Validator/RecursiveContextualValidator.php

@@ -378,7 +378,7 @@ private function validateObject($object, $propertyPath, array $groups, $traversa
      * objects are iterated as well. Nested arrays are always iterated,
      * regardless of the value of $recursive.
      *
-     * @param array|\Traversable        $collection    The collection
+     * @param iterable                  $collection    The collection
      * @param string                    $propertyPath  The current property path
      * @param string[]                  $groups        The validated groups
      * @param bool                      $stopRecursion Whether to disable