Fix parallels support after #953

[bassam]

This PR adds vendor deps for parallels, fixes a compile issue, and enables parallels
as one of the default driver.

It's a continuation of the work in #953 and replaces #2807

/cc @denji @tstromberg

[minikube-bot]

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[k8s-ci-robot]

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[afbjorklund]

Does those vendor changes mean we have to bundle the driver ? Or why can't we just use it as external ?

[tstromberg]

Does those vendor changes mean we have to bundle the driver ? Or why can't we just use it as external ?

Good point. What is the authoritative download location for the driver?

[afbjorklund]

AFAIK it lives at https://github.com/machine-drivers/docker-machine-parallels

Hmm, or maybe that is https://github.com/Parallels/docker-machine-parallels

[bassam]

one is a fork of the other. I've use github.com/Parallels/docker-machine-parallels in this PR.

[tstromberg]

@minikube-bot OK to test