Merge branch '5.1' into 5.x

* 5.1:
  [Messenger][Doctrine] Avoid early db access for pgsql detection
  Add missing use statement

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -77,6 +77,7 @@
 use Symfony\Component\Lock\LockInterface;
 use Symfony\Component\Lock\PersistingStoreInterface;
 use Symfony\Component\Lock\Store\StoreFactory;
+use Symfony\Component\Lock\StoreInterface;
 use Symfony\Component\Mailer\Bridge\Amazon\Transport\SesTransportFactory;
 use Symfony\Component\Mailer\Bridge\Google\Transport\GmailTransportFactory;
 use Symfony\Component\Mailer\Bridge\Mailchimp\Transport\MandrillTransportFactory;