The volume is created as empty, so make sure that we run a
container to do the initial copy of /var from the image.

This is to avoid race conditions later on, where the preload
starts to use the created volume for packing up the tarball.

The messages are different between "inspect" and "container inspect",
and also changed a bit in format between Podman v1 and Podman v2.

Support all of them, for compatibility with different versions of
Docker and Podman. Was causing restarts and failures, with KIC.

Should avoid errors like: map has no entry for key "State"

When inspecting a volume, rather than a container or image

And add an active variable, similiar to docker

Since it doesn't work for either "run" or "start"

	Error: unknown flag: --cgroup-manager

When running with podman, to match the run cmd

Previously hardcoded to *always* use a Docker volume,
even if using a different container driver (podman).

Move the "sudo" prefix to a central location, instead of
having it all over the place. Assume only needed on Linux.

Reverted 22aa1aff by accident

Podman requires both memcg and memcg_swap for it (--memory).

Docker will still limit memory, without swap limit support.