utils/ap51-flash: import from old-packages and update

Signed-off-by: Russell Senior <russell@personaltelco.net>

utils/ap51-flash/files/ap51-flash.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+NAME=ap51-flash
+rootfs=""
+kernel=""
+ubnt=""
+
+[ $1 -eq "1" ] && loop="1"
+ifname="$2"
+[ -n "$3" ] && rootfs="--rootfs $3"
+[ -n "$4" ] && kernel="--kernel $4"
+[ -n "$5" ] && ubnt="--ubnt $5"
+
+while [ 1 ]; do
+	start-stop-daemon -S -m -p /var/run/$NAME-$ifname.pid -n $NAME \
+		-x /usr/sbin/$NAME -- --flash-from-file $rootfs $kernel $ubnt $ifname
+	
+	rm /var/run/$NAME-$ifname.pid
+	[ "$loop" != "1" ] && break
+	sleep 15
+done