csi: controller unpublish should check current alloc count #8604
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Using the count of node claims from earlier in the
CSIVolume.Unpublish
RPCdoesn't correctly account for cases where the RPC was interrupted but
checkpointed. Instead, we'll check the current allocation count and status to
determine whether we need to send a controller unpublish.
I've pulled this changeset out of #8584 because it's not really related.