small cleanup
small cleanup

andrewrothstein/skydns,loveshell/skydns,ZeaLoVe/skydns,erimatnor/skydns-kubernetes,skynetservices/skydns,yonglehou/skydns,zvelo/zvelo-skydns,smarterclayton/skydns,vinhhrv/skydns,hw-qiaolei/skydns,AdoHe/skydns,nicescale/skydns,zhang0137/skydns,weekface/skydns,tonicbupt/skydns,tuannvm/skydns,no2key/skydns,netf/skydns