Allow bundling dedicated nftables container in Infix images. With this
container, the /etc/nftables.conf can be kept as part of the device's
startup-config (base-64 coded binary format). Highly useful in advanced
setups, either with dedicated interfaces in the container, or when run
in host network mode.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
