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

ConsoleEvents.php

@@ -26,7 +26,7 @@ final class ConsoleEvents
     /**
      * The COMMAND event allows you to attach listeners before any command is
      * executed by the console. It also allows you to modify the command, input and output
-     * before they are handled to the command.
+     * before they are handed to the command.
      *
      * @Event("Symfony\Component\Console\Event\ConsoleCommandEvent")
      */