- Use kubeadm configuration to not set taints
on control plain nodes (instead of removing them after
deployment).
- Fix ssh client key permissions.
- Update the Mariadb ingress test job so it is inherinted
from the plain compute-kit test job. And also remote
it from the check pipeline.
Change-Id: I92c73606ed9b9161f39ea1971b3a7db7593982ff