su_ldap: add missing env parameter

manifests/init.pp

@@ -33,6 +33,8 @@
 class su_ldap (
   $hosting_model = 'traditional',
   #
+  $env            = undef,
+  #
   $auth_gssapi    = true,
   $auth_simple    = true,
   #
@@ -132,7 +134,7 @@ class su_ldap (
   if ($enable_lb_bigip) {
     lb::bigip { 'ldap':
       ensure        => present,
-      bigip_service => 'ldap-${env}',
+      bigip_service => "ldap-${env}",
       remctl_cmd    => 'ldap-bigip',
       signal_port   => '8389',
     }