Merge branch '5.0'

* 5.0: (47 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 security upgrade file
  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
  Drop WebServerBundle directory
  [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
  [DoctrineBridge] Fixed cs in DoctrineType
  [Monolog Bridge] Fixed accessing static property as non static.
  Improve Symfony description
  [Mailer] Add UPGRADE entries about Envelope and MessageEvent
  ...

Author: Robin Chalas

Mailchimp/Transport/MandrillHttpTransport.php

@@ -60,7 +60,7 @@ protected function doSendHttp(SentMessage $message): ResponseInterface
             throw new HttpTransportException(sprintf('Unable to send an email (code %s).', $result['code']), $response);
         }
 
-        $message->setMessageId($result['_id']);
+        $message->setMessageId($result[0]['_id']);
 
         return $response;
     }

MandrillHttpTransport.php

@@ -60,7 +60,7 @@ protected function doSendHttp(SentMessage $message): ResponseInterface
             throw new HttpTransportException(sprintf('Unable to send an email (code %s).', $result['code']), $response);
         }
 
-        $message->setMessageId($result['_id']);
+        $message->setMessageId($result[0]['_id']);
 
         return $response;
     }