Abishopric/replicator

@mpuncel @petertseng this is the first set of commits that implement the replicator, which acts as a simple rollout mechanism for a single pod to multiple nodes. This is not ready to be merged.
You look up the health checks for every node assigned to a service, or vice versa for every service on a particular node. The `ServiceStatus` returns the health for every node assigned to the service ID, and this method just finds the node you're interested in within that result.