Move k8s base plays to dedicated directory

Steve Starkerequested to merge
feature/create-dedicated-k8s-base into devel 
Following the style of the kms and ksl layer.

This commit also renames the stage2 and stage3 playbook to be compliant
to the naming scheme of the upper layers. Same applies to the the tests.

The "ansbile" directory now contains only ansible related files. Nameley,
the ansible configuration (which is now set as env var in lib.sh) and
the galaxy requirements.

The helper plays have been moved to an own directory as they're used
rather irregularly. Same applies to the k8s upgrade plays.

Merge Prerequisites

  • Description and title are descriptive
  • Code is readable and syntactically correct
  • Code is understandable
  • Tests added (if needed)
  • Docs updated
  • Commit messages look good

As a developer: please do not tick these boxes yourself. As a reviewer: please get yourself a hot beverage.

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