Merge branch '7.0' into 7.1

* 7.0:
  [Messenger] Fix using negative delay
  [Validator] Add missing italian translation
  [Validator] Fix using known option names as field names
  [SecurityBundle] Prevent to login/logout without a request context
  Suppress warnings from is_executable
  Fix expected return type

Author: fabpot

ExecutableFinder.php

@@ -69,7 +69,7 @@ public function find(string $name, string $default = null, array $extraDirs = []
         }
 
         $command = '\\' === \DIRECTORY_SEPARATOR ? 'where' : 'command -v';
-        if (\function_exists('exec') && ($executablePath = strtok(@exec($command.' '.escapeshellarg($name)), \PHP_EOL)) && is_executable($executablePath)) {
+        if (\function_exists('exec') && ($executablePath = strtok(@exec($command.' '.escapeshellarg($name)), \PHP_EOL)) && @is_executable($executablePath)) {
             return $executablePath;
         }