release: fixes to push to docker
release: fixes to push to docker

Last minute fixes to push to hub.docker.com.

miekg/coredns,coredns/coredns,miekg/coredns,jremond/coredns,yongtang/coredns,jremond/coredns,ii/coredns,ii/coredns,chrisohaver/coredns,johnbelamaric/coredns,johnbelamaric/coredns