WIP: Upgrade kubernetes library

Open Alessio Caiazza requested to merge 2742-kubernetes-client-4.0.0 into master

What does this MR do?

This MR upgrades k8s library moving from the whole kubernetes codebase to just the go client.

Why was this MR needed?

#2742 requires k8s 1.7

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

Relates to #2742