Replace ::class constant with the fully qualified class name

The currently installed version of JMSTranslationBundle requires an old version
of the nikic/php-parser package, which doesn't support the ::class keyword
introduced in PHP 5.5.

This should be fixed by upgrading JMSTranslationBundle to a more recent version.

See nikic/PHP-Parser#200 for more information.

src/Surfnet/StepupSelfService/SelfServiceBundle/DependencyInjection/SurfnetStepupSelfServiceSelfServiceExtension.php

@@ -74,7 +74,7 @@ private function parseSecondFactorTestIdentityProviderConfiguration(
         array $identityProvider,
         ContainerBuilder $container
     ) {
-        $definition = new Definition(IdentityProvider::class);
+        $definition = new Definition('Surfnet\SamlBundle\Entity\IdentityProvider');
         $configuration = [
             'entityId' => $identityProvider['entity_id'],
             'ssoUrl' => $identityProvider['sso_url'],