lunar-tools: version 2013.3, detect NICs automatically

lnet will now list all available (unconfigured) network interfaces
using a menu instead of having an input field where you need to know
which interfaces you have on your system. This will help a lot
using systemd's new NIC naming scheme.
Merge pull request #465 from Ratler/lunar-tools

lunar-tools: version 2013.3, detect NICs automatically