(netflow) fix config, INGRESS + EGRESS

src/etc/rc.d/netflow

@@ -69,6 +69,7 @@ setup_interface()
        name	$interface:lower netflow_$interface
        connect $interface: netflow_$interface: upper	out$ifIndex
        mkpeer netflow_$interface: ksocket export$nfversion inet/dgram/udp
+       msg netflow_$interface: setconfig {iface=$ifIndex conf=3}
        msg netflow_$interface:export$nfversion connect inet/$netflow_int_destination
 SEQ
 }