example network script will misname interface if installing stretch

[qwer at vienna.at]

On Sat, Jul 16, 2016 at 02:18:25PM -0700, Ian Kelling wrote:
> Using jessie as the base os to install stretch.
> 
> 30-interface will setup /etc/network/interfaces with
> something like eth0, and if you upgrade to stretch,
> it will reboot and eth0 is now named something like
> enp3s0f1.
> 
> This was with version 5.0.3, so hopefully it's
> still current.
 
And!
Not all programs accept other names than ethx.