unbound reloads config on SIGHUP, so add the reload command

external/bsd/unbound/etc/rc.d/unbound

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# $NetBSD: unbound,v 1.1 2016/08/20 11:20:31 christos Exp $
+# $NetBSD: unbound,v 1.2 2017/10/25 09:13:41 roy Exp $
 #
 
 # PROVIDE: named
@@ -16,6 +16,7 @@ command="/usr/sbin/${name}"
 pidfile="/var/run/${name}.pid"
 required_files="/etc/${name}/${name}.conf"
 start_precmd="unbound_precmd"
+extra_commands="reload"
 
 unbound_migrate()
 {