kolla-kubernetes is using its own configuration generation[0], so it is
time for kolla-ansible to remove the related code to simplify the
logical.

[0] https://github.com/openstack/kolla-kubernetes/tree/master/ansible

Change-Id: I7bb0b7fe3b8eea906613e936d5e9d19f4f2e80bb
Implements: blueprint clean-k8s-config