rename role common to kubernetes/preinstall

cluster.yml

roles/kubernetes/preinstall/defaults/main.yml

roles/kubernetes/preinstall/files/bootstrap.sh

roles/kubernetes/preinstall/files/get-pip.py

roles/kubernetes/preinstall/files/runner

roles/kubernetes/preinstall/tasks/download.yml

roles/kubernetes/preinstall/tasks/main.yml

roles/kubernetes/preinstall/tasks/python-bootstrap.yml