fix docker build (#673)
fix docker build (#673)


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