scripts: move gateway stubs into gw/ packages
scripts: move gateway stubs into gw/ packages

mqliang/etcd,li-ang/etcd,rnaveiras/etcd,YuleiXiao/etcd,armstrongli/etcd,visheshnp/etcd,lorneli/etcd,plasticbox/etcd,gyuho/etcd,etcd-io/etcd,whuwxl/etcd,yudai/etcd,whuwxl/etcd,mqliang/etcd,glevand/coreos--etcd,yudai/etcd,fanminshi/etcd,mqliang/etcd,mkumatag/etcd,xiang90/etcd,ajityagaty/etcd,sebrandon1/etcd,coreos/etcd,bdarnell/etcd,a-robinson/etcd,rnaveiras/etcd,sinsharat/etcd,etcd-io/etcd,akauppi/etcd,etcd-io/etcd,plasticbox/etcd,YuleiXiao/etcd,heyitsanthony/etcd,li-ang/etcd,fanminshi/etcd,mkumatag/etcd,vimalk78/etcd,dannysauer/etcd,visheshnp/etcd,coreos/etcd,bluebreezecf/etcd,xiang90/etcd,cockroachdb/etcd,gyuho/etcd,dannysauer/etcd,sinsharat/etcd,lorneli/etcd,cockroachdb/etcd,vimalk78/etcd,rnaveiras/etcd,bluebreezecf/etcd,mickep76/etcd,ajityagaty/etcd,bdarnell/etcd,akauppi/etcd,armstrongli/etcd,mkumatag/etcd,heyitsanthony/etcd,joshix/etcd,a-robinson/etcd,glevand/coreos--etcd,mickep76/etcd,ajityagaty/etcd,sebrandon1/etcd,joshix/etcd