Include HTTP HEAD calls to REST API

[mercadoa]

It seems that servant doesn't generate HEAD endpoints by default.

• [ ] implement generation of HEAD endpoints for all existing GET APIs.
• [ ] implement clients for HEAD endpoints
• [ ] include pagination information into the HTTP headers and document this
• [ ] add test cases

[mercadoa]

➤ Lars Kuhtz commented:

This is needed for Kademlia P2P for PING calls.

[mercadoa]

➤ Stuart Popejoy commented:

Pulling this off Testnet as Kademlia is not a testnet milestone, can always add back if needed.