Add warn if kvm driver version is old

[josedonizetti]

issue: #4658

[minikube-bot]

Can one of the admins verify this patch?

[k8s-ci-robot]

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[josedonizetti]

@medyagh Let me know what you think about the changes. I've added a constant to the kvm documentation, we could start enforcing it everywhere we link to the documentation, that way if we need to change one day, it's a single change.

I'll try to simplify the documentation now. Although I'm intrigued the PR #4681 make this one unnecessary.

[medyagh]

I think this PR could be used to detect the too old KVM drivers that we want to enforce the upgrade ( before the user waits a few minutes till the error happen) if we know the kvm driver is too old. we should end gracefuly without error.

the other PR is good when minikube crashes with an error. it is meant as an after-happened handling, so we have less support ticket.

so this is PR is still helpful and needed to detect sooner

[josedonizetti]

@medyagh I've added an upgrade section to the KVM documentation. I know you mentioned we had too many ifs, but it kind of seems necessary to explain about dependencies, and possible problems with libvirtd. Wdyt?

[medyagh]

Looks good !

[medyagh]

@minikube-bot OK to test