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We rename it to EPHEMERAL_BLOCK_DEVICE_MAPPINGS, and we also change the value so that it starts with a `,`, instead of always inserting a comma before it. In this way the value can be empty. Also, if the user sets the (currently experimental) KUBE_AWS_STORAGE environment variable to be "ebs", then we will not mount any instance storage which will cause the machines to use EBS storage instead.