Doc: how to use Azure DNS from non-Azure cluster (#385)
Doc: how to use Azure DNS from non-Azure cluster (#385)

* How to use Azure DNS from non-Azure cluster

If the cluster is not Azure Container Service (or acs-engine) the configuration file for Azure DNS needs to be created manually.

* Azure.md, give explicit name to Service Principal

kubernetes-incubator/external-dns,kubernetes-incubator/external-dns