fff-network: remove iwconfig

iwconfig is upstream scheduled for removal and no longer working.
It is only used once to get the txpower for the nodewatcher.

Fixes: #327

Signed-off-by: Robert Langhammer <rlanghammer@web.de>

src/packages/fff/fff-network/files/usr/lib/nodewatcher.d/20-interfaces.sh

@@ -53,7 +53,7 @@ for filename in $(grep 'up\|unknown' /sys/class/net/*/operstate); do
 		/type/ { split($0, t, " "); printf "<wlan_type>"t[2]"</wlan_type>" }
 		/channel/{ split($0, c, " "); printf "<wlan_channel>"c[2]"</wlan_channel>" }
 		/width/{ split($0, w, ": "); sub(/ .*/, "", w[2]); printf "<wlan_width>"w[2]"</wlan_width>" }
-		/txpower/{ print "<wlan_tx_power>"$2,$3"</wlan_tx_power>" }
+		/txpower/{ print "<wlan_tx_power>"$2"dBm</wlan_tx_power>" }
 	')
 
 	interface_data=$interface_data"</$iface>"