templates.go: Update DNS manifests template.
templates.go: Update DNS manifests template.

ericchiang/bootkube,kubernetes-incubator/bootkube,hongchaodeng/bootkube,diegs/bootkube,hongchaodeng/bootkube,dghubble/bootkube,diegs/bootkube,ericchiang/bootkube,hongchaodeng/bootkube,dghubble/bootkube,diegs/bootkube,ericchiang/bootkube,kubernetes-incubator/bootkube,dghubble/bootkube,kubernetes-incubator/bootkube