Only show pulling base image when actually pulling

[afbjorklund]

Only show the weird tractor, when actually doing the download

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[medyagh]

Only show the weird tractor, when actually doing the download

could u please paste the output after this PR ?

[afbjorklund]

BEFORE

✨  Using the docker driver based on existing profile
👍  Starting control plane node minikube in cluster minikube
🚜  Pulling base image ...
🏃  Updating the running docker "minikube" container ...

AFTER

✨  Using the docker driver based on existing profile
👍  Starting control plane node minikube in cluster minikube
🏃  Updating the running docker "minikube" container ...

It doesn't actually pull the base image, since it already has it.
(and even when it does pull it, there is no output.. as in #7012)