When docker driver fails, we try to use an (unspecified) external VM instead

[afbjorklund]

As seen in #10459 (comment)

❗ Startup with docker driver failed, trying with alternate driver ssh
🤦 StartHost failed, but will try again: config: please provide an IP address

It's not possible to use a remote VM ("ssh" driver), without providing the address to it...

We should also not silently fallback to running locally ("none" driver), because of no isolation.

✨ Automatically selected the docker driver. Other choices: kvm2, virtualbox, none, ssh, podman (experimental)

Currently the priority is "Discouraged", which doesn't really the "Unconfigured" state properly.

The goal should be to make them both opt-in, and not have them on the regular Alternatives list.

pkg/minikube/registry/drvs/none/none.go:                Priority: registry.Discouraged, // requires root
pkg/minikube/registry/drvs/ssh/ssh.go:          Priority: registry.Discouraged, // requires external VM

[afbjorklund]

This is some kind of (undesired) side-effect of #7389