k8s client vs fabric8 discovery implementation

[wind57]

In the k8s client, our discovery implementation is based on listers:

Lister<V1Service> ...
Lister<V1Endpoints> ...

In contrast, in fabric8 we query for the data on demand every time we need it, or in other terms, we do not use listers.

I think fabric8 should align here. I am basing my understanding on the fact that k8s client implementation was done after fabric8, so I assume listers are the way we wanna go for both clients.

Let me know what you think, and I can start working in one of the directions. Thank you

[ryanjbaxter]

Sounds good