ISO: Upgrade podman to 3.1.2

[afbjorklund]

There is a new podman 3.2.1 too, but it hasn't been packaged or tested.

KIC is currently using v3.1.2 from OBS (Kubic project).

podman/now 100:3.1.2-1 amd64 [installed,local]

podman | 100:3.1.2-1 | http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_20.04 Packages

So use Podman 3.1.2, until Podman 3.2.1 is properly released upstream...

NOTE: Clients must use older versions, either 2.2.1 or 3.1.2 (recommended)

Error: cannot connect to the Podman socket, please verify that Podman REST API service is running: server API version is too old. Client "3.2.0" server "3.1.2"

Or use minikube image, instead of bothering with minikube podman-env

NOTE: We use whatever version of Buildah that is bundled with Podman.

$ /usr/bin/podman --version
podman version 3.1.2
$ sudo podman info | grep buildah
  buildahVersion: 1.21.0

We could use buildah bud instead of podman build, if there was demand.

---

Stop using /etc/cni/net.d: #11194

Closes #11706

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