Merge branch '3.4' into 4.0

* 3.4:
  use brace-style regex delimiters
  Fixed typo RecursiveIterator -> RecursiveIteratorIterator
  [Cache] fix logic for fetching tag versions on TagAwareAdapter
  [FrameworkBundle] Use the correct service id for CachePoolPruneCommand in its compiler pass
  Hide short exception trace by default
  [Doctrine Bridge] fix priority for doctrine event listeners
  [Validator] make phpdoc of ObjectInitializerInterface interface more accurate
  [Validator] fixes phpdoc reference to an interface that was removed in Symfony 3.0

Author: fabpot

Command/ServerLogCommand.php

@@ -15,6 +15,8 @@
 use Symfony\Bridge\Monolog\Formatter\ConsoleFormatter;
 use Symfony\Bridge\Monolog\Handler\ConsoleHandler;
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\LogicException;
+use Symfony\Component\Console\Exception\RuntimeException;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -78,7 +80,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $filter = $input->getOption('filter');
         if ($filter) {
             if (!class_exists(ExpressionLanguage::class)) {
-                throw new \LogicException('Package "symfony/expression-language" is required to use the "filter" option.');
+                throw new LogicException('Package "symfony/expression-language" is required to use the "filter" option.');
             }
             $this->el = new ExpressionLanguage();
         }
@@ -97,7 +99,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         if (!$socket = stream_socket_server($host, $errno, $errstr)) {
-            throw new \RuntimeException(sprintf('Server start failed on "%s": %s %s.', $host, $errstr, $errno));
+            throw new RuntimeException(sprintf('Server start failed on "%s": %s %s.', $host, $errstr, $errno));
         }
 
         foreach ($this->getLogs($socket) as $clientId => $message) {

Command/ServerStatusCommand.php

@@ -13,6 +13,7 @@
 
 use Symfony\Bundle\WebServerBundle\WebServer;
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -74,7 +75,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 } elseif ('port' === $filter) {
                     $output->write($port);
                 } else {
-                    throw new \InvalidArgumentException(sprintf('"%s" is not a valid filter.', $filter));
+                    throw new InvalidArgumentException(sprintf('"%s" is not a valid filter.', $filter));
                 }
             } else {
                 return 1;