ffwizard-berlin: add openvpn keys /lib/upgrade/keep.d/
olsrd-defaults: remove txtinfo plugin

see https://github.com/freifunk-berlin/firmware/issues/103
freifunk-defaults: remove firewall rulesets
add new package freifunk-berlin-firewall-defaults
ffwizard-berlin: remove firewall defaults
ffwizard-berlin: fix url in Makefile
olsrd-defaults: add rt tables