clean pre-submit checks (#2367)
clean pre-submit checks (#2367)

Automatically submitted.
johnbelamaric/coredns,jremond/coredns,ii/coredns,miekg/coredns,chrisohaver/coredns,johnbelamaric/coredns,jremond/coredns,yongtang/coredns,ii/coredns,miekg/coredns,coredns/coredns