Download ISO image before Docker images, as it's required first #4141
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In minikube v1.0.0, we download Docker images before the ISO image.
It turns out that this isn't a very good use of our time, as the ISO image is required to start the VM.
This PR changes the behavior so that startup blocks until the ISO is downloaded, so that we can download Docker images while we wait for the VM to boot up.
This resolves #4035 and helps address an issue raised in #4039