* Use versioned API types from the client-go library

Wherever possible, use the k8s.io/client-go/kubernetes.Interface type
in favor of the client-related types from package

  k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset

The latter are still required by the kubectl "reaper" types used in
the "installer" and "kube" packages.

* Accept the default deployment replica count of one

Don't bother requesting a single replica explicitly.