The extended kill delay (10 sec) is sometimes not enough for complex
system containers. Also, podman sometimes take the opportunity to do
housekeeping tasks when stopping a container. So, allow for up to 30
sec. grace period before we send SIGKILL.
With the latest image prune extension, set a 60 sec. timeout for the
cleanup task, in case podman gets stuck. This to prevent any future
mishaps.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>