Use debian as default image for DO images

[srikiz]

Since coreOS will no longer be supported, changing the DO image default to Debian instead.

[k8s-ci-robot]

Hi @srikiz. Thanks for your PR.

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[hakman]

/ok-to-test
/lgtm

[rifelpet]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rifelpet, srikiz

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[rifelpet]

ugh there was an issue with the netlify jobs so prow won't merge the PR. I don't have permission to retry the jobs, but you could amend the commit and force push it to trigger a new set of jobs that would hopefully succeed.

[fejta-bot]

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[hakman]

Canceling LGTM until netlify is fixed.
/lgtm cancel

[johngmyers]

Should also update the references to CoreOS in docs/getting_started/digitalocean.md

[srikiz]

Thanks for mentioning this @johngmyers - updated DO docs now.

[hakman]

@srikiz should this be part of 1.17?
/lgtm

[srikiz]

@hakman - Yes, I'll create a cherry-pick PR sometime today. Thanks !
When is 1.17 getting freezed?

[hakman]

1.17 is being prepared for release, but this seems pretty important and simple change.
Maybe you can also cherry-pick #9179 and hope that gets accepted also.
Thanks!