Issue 2185 - Migrate Rieveld superuser creation to fixture

modules/rietveld/manifests/init.pp

 class rietveld(
     $domain,
     $certificate,
     $private_key,
-    $is_default=false
+    $is_default = false,
+    $fixtures = hiera('rietveld::fixtures', {}),
   ) inherits private::rietveld {
 
   include nginx
   $django_home = '/home/rietveld/django-gae2django'
   $rietveld_home = "${django_home}/examples/rietveld"
 
   Exec {
     path => '/usr/bin:/usr/sbin:/bin:/usr/local/bin',
   }
 
@@ skipping 96 matching lines @@
       source => $source,
       owner => 'rietveld',
       mode => 0640,
       notify => $ensure ? {
         present => Exec[$destination],
         default => [],
       }
     }
   }
 
-  $fixtures = hiera('rietveld_fixtures', {})
   create_resources(rietveld::fixture, $fixtures)
 }