kubernetes-controller-manager-anchor pods get stuck in Terminating state
because the pre-stop script tries to touch /tmp/stop, which is on a read
only root filesystem.
This change mounts an emptyDir at /tmp to resolve the issue.
The same change is applied to apiserver, etcd, and scheduler anchors, to
prevent the issue if readOnlyRootFilesystem is enabled.
Related change for haproxy:
https://review.opendev.org/685711/
Change-Id: I784498e0dc24da91a983716029973919b96a3055
a7c7282ba4