hyparview-example

* Hyparview Example

A sample client for http://github.com/hashicorp/hyparview over TLS

- [X] Configuration in environment see `main.go`
- [X] Key generation via make (requires installed consul)
- [X] GRPC communication that requires client certificates
  - Enforces CA signing
  - Only configures CA, own certs
- [X] `bin/run` Starts a connected cluster
- [X] Meaningful status logging
- [X] Mechanism to create gossip application messages
- [ ] go mod to include hyparview

* Demo

- [X] Think about threads (just copies)
- [X] Use the private ips (only public, just opened up the ports)
- [ ] d3 graph updates
- [ ] node color by app value
- [X] remove missing links/nodes
- [ ] gossip on click