Add listen ports to cacti

The apache puppet module determines what ports to listen to by using
provided ports from calls to apache::vhost. Before
Ib282dd506a5086cfca5c8400bf27cca10099f59d the default vhost would
cause apache to listen on 80+443.

Since we use a custom vhost template we either need to add the listen
directive there (not preferred) or instruct puppet-apache to manage
its ports.conf.

Change-Id: I84760c1d7e823a34f6253c80022134ec568a0468

modules/openstack_project/manifests/cacti.pp

@@ -25,6 +25,9 @@ class openstack_project::cacti (
     ensure => present,
   }
 
+  ::apache::listen { '80': }
+  ::apache::listen { '443': }
+
   ::apache::vhost::custom { $::fqdn:
     ensure  => present,
     content => template('openstack_project/cacti.vhost.erb'),