Noissue - Ensure the correct FQDNs are computed for Nagios

modules/nagios/manifests/server.pp

 class nagios::server(
     $domain,
     $certificate,
     $private_key,
     $is_default=false,
     $htpasswd_source,
     $admins,
     $zone,
   ) {
 
@@ skipping 158 matching lines @@
   create_resources(nagios::server::generic_host, $nagios_generic)
 
   define generic_host(
     $ip,
     $ssh_public_key = undef,
     $role = undef,
     $dns = undef,
     $groups = [],
   ) {
 
-    $fqdn_name = join([$name, $nagios::server::zone], '.')
+    if $dns == undef {
+      $fqdn_name = join([$name, $nagios::server::zone], '.')
+    } else {
+      $fqdn_name = $dns
+    }
 
     nagios_host {$fqdn_name:
       use => 'generic-host',
       hostgroups => $groups,
     }
   }
 }