hood files: Move files from /www to /tmp and link there

With this patch, changing the hood file happens in
memory, so we do not have to write on flash "frequently".

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Robert Langhammer <rlanghammer@web.de>
Reviewed-by: Fabian Bläse <fabian@blaese.de>
Tested-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Tim Niemeyer <tim@tn-x.org>

src/packages/fff/fff-hoodutils/files/lib/functions/fff/keyxchange

@@ -6,7 +6,7 @@
 
 hoodfiletmp="/tmp/hoodfile"
 hoodfileref="/tmp/hoodfileref"
-hoodfilewww="/www/hood/keyxchangev2data"
+hoodfilewww="/tmp/hoodfilewww"
 
 getJsonPath() {
 	jsonfile=""

src/packages/fff/fff-web/files/etc/uci-defaults/93-fff-uhttpd

@@ -1,5 +1,9 @@
 #!/bin/sh
 
+. /lib/functions/fff/keyxchange
+
+ln -s "$hoodfilewww" /www/hood/keyxchangev2data
+
 uci batch <<EOF
   delete uhttpd.main
   delete uhttpd.public