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This introduces a new storage type: local. Local storage type will tell the kata-agent to create an empty directory in the sandbox directory within the VM. K8s host emptyDirs will then use the local storage type and mount it inside each container. By doing this, we utilise the storage medium that the sandbox uses. In most cases this will be 9p. If the VM is using device mapper for container storage, the containers will benefit from the better performance of device mapper for host emptyDir. Fixes #1472 Signed-off-by: Alex Price <aprice@atlassian.com>