Don't use boot2docker ISO on disk
Don't use boot2docker ISO on disk

This was a hack for the DockerCon demo. We do want some way of
caching the boot2docker image, but this certainly isn't the way.

Signed-off-by: Ben Firshman <73675debcd8a436be48ec22211dcf44fe0df0a64@firshman.co.uk>

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