Can’t generate JsonSchema due to missing JsonSchema implementation for IpNetwork

[cab404]

I’ve tried adding JsonSchema for our config (because having one will allow us adding custom config editors with validation and stuff). However, I was blocked on missing implementation of JsonSchema for IpNetwork. We either need to somehow pass it through into JsonSchema derive macro, or add implemetation to IpNetwork crate itself.

Related: https://github.com/achanda/ipnetwork/issues/153