nlbwmon: add hotplug script to reload after interface ifup

Add a hotplug script to reload nlbwmon's config after interface
ifup actions.

That should improve the detection of the IPv6 LAN address
that can get enabled a bit later in the boot process.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

net/nlbwmon/files/nlbwmon.hotplug

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+[ -n "$DEVICE" ] || exit 0
+
+[ "$ACTION" = ifup ] && /etc/init.d/nlbwmon enabled && {
+	/etc/init.d/nlbwmon reload
+	logger -t nlbwmon "Reloading nlbwmon due to $ACTION of $INTERFACE ($DEVICE)"
+}
+