LXD demo server

Let website visitors spawn test containers
This is the service behind https://linuxcontainers.org/lxd/try-it

It can be used to easily allow visitors on a website to spawn a container, get a shell inside it and play around with some piece of software for a limited amount of time.

Supported features:
- Get service status (available features, availability, addresses, ...)
- Read and validate terms of service
- Spawn a demo container
- Get info on running container
- Access container console
- Send feedback on demo experience

To install:
- sudo snap install lxd
- sudo lxd init
- sudo snap install lxd-demo-server
- sudo snap connect lxd-demo-server:lxd lxd:lxd