Merge branch '5.1' into 5.2

* 5.1:
  Fix transient tests
  Fix class resolution in Doctrine EventListenerPass
  [Serializer] Fix tests  marked as incomplete
  propagate the object being validated to sub-constraints
  [Translator] fix handling plural for floating numbers
  fix redis messenger options with dsn
  Update ConsoleEvents.php
  allow Doctrine persistence 2 too
  [Messenger] Fix transporting non-UTF8 payloads by encoding them using base 64
  add doctrine/persistence as a dev requirement
  Exclude non-initialized properties accessed with getters

Author: nicolas-grekas

DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php

@@ -85,7 +85,7 @@ private function addTaggedSubscribers(ContainerBuilder $container, array &$liste
 
                 if (!isset($managerDefs[$con])) {
                     $managerDef = $parentDef = $this->getEventManagerDef($container, $con);
-                    while ($parentDef instanceof ChildDefinition) {
+                    while (!$parentDef->getClass() && $parentDef instanceof ChildDefinition) {
                         $parentDef = $container->findDefinition($parentDef->getParent());
                     }
                     $managerClass = $container->getParameterBag()->resolveValue($parentDef->getClass());