mqtt-root-CA.pem.crt requires ::logstash to be setup

Otherwise, we raise a puppet error about /etc/logstash not existing.

Change-Id: I073034582bf7a28e14eb504d02e6d91dd1c0ae61
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

modules/openstack_project/manifests/logstash_worker.pp

@@ -69,6 +69,7 @@ class openstack_project::logstash_worker (
       owner   => 'root',
       group   => 'root',
       mode    => '0555',
+      require => Class['::logstash'],
   }
 
   validate_array($elasticsearch_nodes)  # needed by output.conf.erb