Add some missing zuul bits.

Change-Id: I736c3eab317bf68bc295ece81e88933f005e26e4

manifests/site.pp

@@ -241,6 +241,7 @@ node "jenkins.openstack.org" {
       'python-swiftclient',
       'quantum',
       'swift',
+      'zuul',
     ]
   }
   class { 'zuul': }

modules/zuul/manifests/init.pp

@@ -25,4 +25,7 @@ class zuul ()
     subscribe => [ Exec["get_zuul"], Exec["update_zuul"] ],
   }
 
+  file { "/etc/zuul":
+    ensure => "directory",
+  }
 }