use cos_containerd as default image

[mattcary]

/kind cleanup

None

/assign @amacaskill

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In response to this:

/kind cleanup

None

/assign @amacaskill

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[amacaskill]

/lgtm

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@amacaskill: changing LGTM is restricted to collaborators

In response to this:

/lgtm

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[saikat-royc]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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