Ensure that resolvconf(8) preserves the edns0 setting.

Approved by:	re (blanket)

usr.sbin/unbound/local-setup/local-unbound-setup.sh

@@ -157,6 +157,7 @@ gen_resolv_conf() {
 gen_resolvconf_conf() {
 	echo "# Generated by $self"
 	echo "name_servers=\"127.0.0.1\""
+	echo "resolv_conf_options=\"edns0\""
 	echo "unbound_conf=\"${forward_conf}\""
 	echo "unbound_pid=\"${pidfile}\""
 	echo "unbound_service=\"${service}\""