kubeReserved bugfix for instances >130GiB memory

[dalees]

Change description

The function memory_reservation_mebibytes would return 9GiB reserved memory for a 129GiB instance, and only 2.6GiB reserved at 130GiB due to a missing line of code.

Additional context

Plot of reserved memory values before and after this proposed change:

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @dalees. Thanks for your PR.

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