Import ethtool from the old repo, add new package fastd and its dependencies

Hi,
this adds the following packages:

* ethtool (from the old repo, updated and cleaned up)
* fastd (a very small VPN tool developed by me which has gained some popularity amongst the Freifunk communities)
* fastd's dependencies:
    * nacl (from the old repo, cleaned up)
    * libuecc (small ECC library I've developed for fastd)