Merge branch '4.4' into 5.0

* 4.4: (38 commits)
  reset the kernel cache after each test
  [HttpKernel] Ability to define multiple kernel.reset tags
  [Routing] Continue supporting single colon in object route loaders
  [FWBundle] Remove unused parameter
  [Intl] [Workflow] fixes English grammar typos
  [Filesystem] [Serializer] fixes English grammar typo
  mailer: mailchimp bridge is throwing undefined index _id when setting message id in mandrill http transport
  has_roles should be is_granted in upgrade files
  [HttpClient] Fix early cleanup of pushed HTTP/2 responses
  skip test on incompatible PHP versions
  [HttpKernel] Don't cache "not-fresh" state
  [FrameworkBundle][Cache] Don't deep-merge cache pools configuration
  [Messenger] Adding exception to amqp transport in case amqp ext is not installed
  [SecurityBundle] Don't require a user provider for the anonymous listener
  [Monolog Bridge] Fixed accessing static property as non static.
  Improve Symfony description
  [Mailer] Add UPGRADE entries about Envelope and MessageEvent
  [FrameworkBundle] fix leftover mentioning "secret:" processor
  Add DateTimeZoneNormalizer into Dependency Injection
  [Messenger] Error when specified default bus is not among the configured
  ...

Author: Robin Chalas

Loader/ObjectLoader.php

@@ -42,10 +42,15 @@ abstract protected function getObject(string $id);
      */
     public function load($resource, string $type = null)
     {
-        if (!preg_match('/^[^\:]+(?:::(?:[^\:]+))?$/', $resource)) {
+        if (!preg_match('/^[^\:]+(?:::?(?:[^\:]+))?$/', $resource)) {
             throw new \InvalidArgumentException(sprintf('Invalid resource "%s" passed to the %s route loader: use the format "object_id::method" or "object_id" if your object class has an "__invoke" method.', $resource, \is_string($type) ? '"'.$type.'"' : 'object'));
         }
 
+        if (1 === substr_count($resource, ':')) {
+            $resource = str_replace(':', '::', $resource);
+            @trigger_error(sprintf('Referencing object route loaders with a single colon is deprecated since Symfony 4.1. Use %s instead.', $resource), E_USER_DEPRECATED);
+        }
+
         $parts = explode('::', $resource);
         $method = $parts[1] ?? '__invoke';