This update for python-kubernetes fixes the following issues:

- python-ipaddress is only required for building on Python2
  (on Python3 is part of the standard library)
- Backport fix for base64 padding in kubeconfig (bsc#1151481)

This update was imported from the SUSE:SLE-15-SP1:Update update project.
This update was imported from the openSUSE:Leap:15.1:Update update project.