Generate the replica-set graph and use it for generating the YAML file.

[spetrovic77]

The benefit of doing so are:

• Enables topo-order graph traversal when generating configs, leading to clearer top-down config generation.
• Makes YAML files stable across versions, something we may need in the future.

[rgrandl]

Also, we may want to add priority classes to containers at some point, so we can somehow try to start services based on the topo order (https://kubernetes.io/docs/concepts/scheduling-eviction/pod-priority-preemption/).

Can you add me as a reviewer as well to all the weaver-kube PRs please?

[rgrandl]

It looks great :)