Investigate removing the cki_lib.kubernetes module

The still-used provided functionality is:

  1. work with ~/.kube/config and in-cluster
  2. some small wrappers

The first should already be provided by https://github.com/kubernetes-client/python/blob/master/kubernetes/base/config/__init__.py#L24, and the second is not really needed.

Edited by Michael Krausch-Hofmann