Fix for Minikube #3495

[jasoncwik]

Change the policy for the minikube-hostpath storage class addon from
Reconcile to EnsureExists. When it's set to reconcile, it's impossible
to change the default storage class in Minikube because it will keep
setting the minikube-hostpath storageclass to default.

Ported from kubernetes/kubernetes#66235

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jasoncwik
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[minikube-bot]

Can one of the admins verify this patch?

[jasoncwik]

/assign tstromberg

[tstromberg]

@minikube-bot OK to test