Fix the zuul reloading on config changes.

Zuul config files were broken out into a new module which introduced
cross module subscription dependencies. To make this work the module
doing the notify/subscribe must include the module the resource that
the subscription/notify is on. To fix this have config files notify
the zuul_reload exec.

Change-Id: I2d9e2236bc378d9dd92f811830dee6540b4cf4e2

manifests/init.pp

@@ -64,7 +64,6 @@ class zuul ()
       command => '/etc/init.d/zuul reload',
       require => File['/etc/init.d/zuul'],
       refreshonly => true,
-      subscribe => [ File["/etc/zuul/layout.yaml"], File["/etc/zuul/logging.conf"], ],
   }
 
   service { 'zuul':