VPN requirements reduce to nothing

[martinthomson]

I think that there is just one thing that merits the inclusion of the VPN section: the ability to configure a resolver for only a subset of all names. But I don't think that introduces any requirements. The essential choice is the same: between parallel configuration for DoT/DoH or talking to the resolver directly.

In other aspects, a VPN is just a network. The fact that VPN configuration is often strongly authenticated doesn't distinguish it from any other type of network-provided resolver. I would suggest that we instead acknowledge that VPNs provide another type of network access and configuration methods that might need to be accommodated by parallel discovery methods.

[chris-box]

VPNs are now removed from the scope of draft -01.