[qmp-system] Fix #361. Add hook for TP-Link TL-WR842N[D]-v2 devices where eth0...

[qmp-system] Fix #361. Add hook for TP-Link TL-WR842N[D]-v2 devices where eth0 and eth1 are swapped:
 - eth0 (blue) => WAN
 - eth1 (yellow) => LAN

packages/qmp-system/files/etc/qmp/hooks/scripts/tl-wr842n-v2.sh

+#!/bin/sh
+# Stage = [birth|firstboot|anyboot|preconf|postconf]
+STAGE="$1"
+
+[ "$STAGE" == "birth" ] && {
+	echo "Configuring network for TL-WR842N[D]-v2"
+	uci set qmp.interfaces.lan_devices="eth1"
+	uci set qmp.interfaces.lan_devices="eth0"
+	uci commit qmp
+}

packages/qmp-system/files/etc/qmp/hooks/tl-wr842n-v2/tl-wr842n-v2.sh

+../scripts/tl-wr842n-v2.sh
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