Merge branch '5.1' into 5.2

* 5.1:
  [Notifier] Improve tests (5.1)
  [Notifier] Fix wrong package names
  [Notifier] [Free Mobile] Could not use custom host in DSN

Author: derrabus

Exception/UnsupportedSchemeException.php

@@ -44,7 +44,7 @@ class UnsupportedSchemeException extends LogicException
         ],
         'rocketchat' => [
             'class' => Bridge\RocketChat\RocketChatTransportFactory::class,
-            'package' => 'rocketchat-notifier',
+            'package' => 'symfony/rocket-chat-notifier',
         ],
         'twilio' => [
             'class' => Bridge\Twilio\TwilioTransportFactory::class,
@@ -64,7 +64,7 @@ class UnsupportedSchemeException extends LogicException
         ],
         'ovhcloud' => [
             'class' => Bridge\OvhCloud\OvhCloudTransportFactory::class,
-            'package' => 'symfony/ovhcloud-notifier',
+            'package' => 'symfony/ovh-cloud-notifier',
         ],
         'sinch' => [
             'class' => Bridge\Sinch\SinchTransportFactory::class,