Static IP migration for 1.x->2.x

[imrehg]

Need to be able to translate between https://docs.resin.io/deployment/network/1.x.x/#set-static-ip

[service_home_ethernet]
Type = ethernet
IPv4 = <static IP>/<netmask>/<gateway>
Nameservers = <nameserver1>,8.8.8.8

and this format https://docs.resin.io/deployment/network/2.0.0/#setting-a-static-ip

...
[ipv4]
address1=<static IP>/<prefix>,<gateway>
dns=<nameserver1>,8.8.8.8;
...

The main tricky part is converting the <netmask> into a <prefix>. Fortunately there's StackOverflow for a bash version: https://stackoverflow.com/questions/20762575/explanation-of-convertor-of-cidr-to-netmask-in-linux-shell-netmask2cdir-and-cdir

The second tricky part setting the right interface for this: static ethernet, static wifi, or something else.... This can get pretty hairy, and need some thought...

Front conversations

[imrehg]

This would be probably just "nice to have" but not a must have for the selfservice release...

[imrehg]

That was wishful thinking, this is very much a must-have, and also better documentation in the meantime...

https://forums.resin.io/t/problem-up-resinos-update-lost-static-ip/2154

[imrehg]

Should be covered by #114

[imrehg]

Not deployed in production yet.

[imrehg]

Deployed.