Add missing cgid module

This was exposed when installing on trusty.

Change-Id: Ic0cc4de17f0490c54293bbe37190654976ff7b57
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

manifests/init.pp

@@ -17,6 +17,9 @@ class mailman($vhost_name=$::fqdn) {
   httpd_mod { 'rewrite':
     ensure => present,
   }
+  httpd_mod { 'cgid':
+    ensure => present,
+  }
 
   file { '/var/www/index.html':
     ensure  => present,