add dup endpoint name test (#1811)
add dup endpoint name test (#1811)


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