Cache: don't use ssh runner for the none driver

[afbjorklund]

Closes #4438

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[medyagh]

I am curious does this also fix this issue ? #4132
Currently if you start minikube with none driver and then repeat the start command, it fails on waiting for SSH

[andrewjcouzens]

@medyagh I just tried compiling this and attempting to use vmdriver=none and I can confirm this patch doesn't fix it, at least not for me.

1031 15:49:51.248712 12005 main.go:110] libmachine: Waiting for SSH to be available...
I1031 15:49:51.248732 12005 main.go:110] libmachine: Getting to WaitForSSH function...
I1031 15:49:51.248750 12005 main.go:110] libmachine: Error getting ssh command 'exit 0' : driver does not support ssh commands

[medyagh]

@andrewjcouzens did you compile against HEAD ? if yes, that would be a bug ! we could create an issue to track it, or re-open the other one

[andrewjcouzens]

@medyagh Yes I compiled against HEAD. Do you mean re-open 4132? If so, it was already open and so I left a comment showing my results (#4132 (comment)). If there is another ticket regarding this issue please let me know and I can also share there. Thank you.