Add DeadlineExceeded pod termination reason

[dansible]

What this PR does / why we need it:
This adds DeadlineExceeded as a valid reason for kube_pod_container_status_terminated_reason and kube_pod_container_status_last_terminated_reason

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[zouyee]

/lgtm

[andyxning]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyxning, dansible, zouyee

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