Silence drupal cron job

* modules/drupal/manifests/init.pp: Since the cron URL can return
content, write it to the bitbucket so that we don't annoy sysadmins
with cronspam every five minutes.

Change-Id: I9df9510eb14e89c380dadba98cd4834a6a83fffc

manifests/init.pp

@@ -244,7 +244,7 @@ class drupal (
 
   cron { $site_name:
     name    => "${site_name}.cron",
-    command => "wget -O - -q -t 1 ${$site_base_url}/cron.php?cron_key=${$conf_cron_key}",
+    command => "wget -O /dev/null -q -t 1 ${$site_base_url}/cron.php?cron_key=${$conf_cron_key}",
     user    => root,
     minute  => '*/5',
     require => [
@@ -252,4 +252,4 @@ class drupal (
       ]
   }
 
-}
+}