Re-remove kube-dns addon

[robrich]

2091f8c on 11/13/18 removed kube-dns addon
3c3b736 on 8/8/18 added back in the reference in addons.go (accidentally?) but didn't add deploy/addons/kube-dns/* files referenced
8bc8816 on 1/15/19 merged in PR #3521

Now when running minikube addons list I see:

...snip...
- kube-dns: disabled
...snip

and when I run minikube addons enable kube-dns I see:

Property name kube-dns not found

This PR attempts to re-remove kube-dns from the addons list.

[k8s-ci-robot]

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[minikube-bot]

Can one of the admins verify this patch?

[robrich]

I signed it

[tstromberg]

Thank you for the patch!

[robrich]

Glad to help. What's the release cadence? (This definitely doesn't deserve it's own release.)