Add Pod Support

[bobhenkel]

It would be very useful to use a pod as a node rather than the actual node.

[bobhenkel]

Looks like skilld-labs/rundeck-kubernetes-step-plugin may do what I was asking for.

[jbguerraz]

Actually this is a good idea IMHO. We could get PODs from K8S and list them as Nodes in Rundeck. Then yet another plugin would allow to run commands over those nodes using K8S exec. That would be cool. For now we (Skilld) don't need it so we're not going to invest time in that yet but if one want to tackle it, that would be super!

[bobhenkel]

Psuedo Idea:

1. Rundeck needs to be able to target/list pods as it target/list nodes. Assuming these pods have a label that says I'm a rundeck-node... So kubectl get pods --selector=rundeck-node=true
2. With the data of what pods we can run things on we can have rundeck run commands like it does on nodes, but on the pods. With something like kubectl exec one-of-the-labeled-pods-1668135175-3rn1l -- date

Not sure at this time how rundeck goes about listing nodes and all that entails.
This might help with this http://rundeck.org/docs/administration/managing-node-sources.html