Update kube-dns to the one bundled with k8s v1.5.1
Update kube-dns to the one bundled with k8s v1.5.1

* kube-dns is now deployed via a deployment instead of a replicaset
* kube-dns supports zero downtime rolling update (https://github.com/kubernetes/kubernetes/pull/37730)
* prometeus metris are exposed

mumoshu/kube-aws,HotelsDotCom/kube-aws,c-knowles/kube-aws,HotelsDotCom/kube-aws,everpeace/kube-aws,kubernetes-incubator/kube-aws,AlmogBaku/kube-aws,camilb/kube-aws,danielfm/kube-aws,iflix-letsplay/kube-aws,camilb/kube-aws,everpeace/kube-aws,danielfm/kube-aws,c-knowles/kube-aws,kubernetes-incubator/kube-aws,mumoshu/kube-aws,AlmogBaku/kube-aws,iflix-letsplay/kube-aws