Add -j option to netaddr info CLI

[jlshix]

A CLI to show network info is awesome!

But we may still need a better output format for further data processing.

The ip -j command is a good reference, which formats all subcommand output to json.

e.g. ip -j route | jq . > local_routes.json

[jstasiak]

Hey, I appreciate the need for something like this but this command is intentionally not supposed to provide any kind of stable output, at least for now – it's just for human consumption and I'm experimenting on it to an extent.

If you need any kind of stable and structured output then I think the best option is just to do the processing you want in Python and use the netaddr API (including dumping data as JSON for further processing if that's needed).