install losetup from util-linux in the ISO

[nixpanic]

The losetup tool is used by Kubernetes to setup BlockMode volumes.
BusyBox provides a version, but it does not have the -j option.

Fixes: #8284
See-also: tested with ceph/ceph-csi#1840

[k8s-ci-robot]

Hi @nixpanic. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nixpanic]

This is ready for review, including it in a next release would be much appreciated!

/assign @tstromberg

[minikube-bot]

Can one of the admins verify this patch?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afbjorklund, nixpanic

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