Allow cri-o offline install

[sebt3]

What type of PR is this?
/kind bug

What this PR does / why we need it:

CRI-O installation cannot operate offline. This PR allow to customize the download URL for CRI-O.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[k8s-ci-robot]

Hi @sebt3. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[floryut]

@sebt3 Good thinking 👍

[floryut]

By the way, please sign CLA and check markdown linting.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, sebt3, spaced

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[oomichi]

/ok-to-test

[oomichi]

/lgtm