Each Openstack `Instance` of ours is passed in a server object which looks like `<Server: full-stack-222-instance-platform-j2gp67wyneov>`. I haven't been able to play with AWS, but i'd guess it's similar. So each `Instance` has a reference to the novaclient `server` object. `parent` is confusing as it looks like it is a reference to the `Cloud`, but it's not.