kubernetes: Force cAdvisor to retrieve data for new hosts
kubernetes: Force cAdvisor to retrieve data for new hosts

Hosts that have had pods scheduled on them may not have containers
yet, so we force retrieval of data from them by creating a dummy
row with not-present and unused data.

Closes #2414
Reviewed-by: Peter <a316049dd34607c62d4611d63ab22a6454add223@redhat.com>

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