Enable cgroup-v2 in minikube-iso image for qemu

[koct9i]

Maybe it is a good time to use cgroup-v2 by default.

For now systemd option "systemd.legacy_systemd_cgroup_controller=yes" is hardcoded in kernel command line in isolinux.cfg

https://github.com/kubernetes/minikube/blob/master/deploy/iso/minikube-iso/board/minikube/x86_64/isolinux.cfg

[afbjorklund]

It would be a good idea, as part of the OS upgrade

BUILDROOT_BRANCH ?= 2021.02.12

But I guess that it should also stop using isolinux and BIOS, and start using grub and UEFI

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close not-planned

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