add datatype to 'listen.?' parameters

Author: kengelhardt-godaddy

manifests/fpm/pool.pp

@@ -136,8 +136,8 @@
   $listen_owner                            = undef,
   $listen_group                            = undef,
   $listen_mode                             = undef,
-  $listen_acl_users                        = undef,
-  $listen_acl_groups                       = undef,
+  Optional[String[1]] $listen_acl_users    = undef,
+  Optional[String[1]] $listen_acl_groups   = undef,
   $user                                    = $php::fpm::config::user,
   $group                                   = $php::fpm::config::group,
   Optional[String[1]] $apparmor_hat        = undef,