tests/e2e: fix gateway tests
tests/e2e: fix gateway tests

Signed-off-by: Gyuho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

etcd-io/etcd,li-ang/etcd,sinsharat/etcd,mkumatag/etcd,mkumatag/etcd,ajityagaty/etcd,gyuho/etcd,mkumatag/etcd,mqliang/etcd,bdarnell/etcd,etcd-io/etcd,xiang90/etcd,sinsharat/etcd,dannysauer/etcd,etcd-io/etcd,cockroachdb/etcd,vimalk78/etcd,glevand/coreos--etcd,dannysauer/etcd,coreos/etcd,rnaveiras/etcd,glevand/coreos--etcd,rnaveiras/etcd,cockroachdb/etcd,fanminshi/etcd,gyuho/etcd,coreos/etcd,mqliang/etcd,lorneli/etcd,bdarnell/etcd,joshix/etcd,joshix/etcd,ajityagaty/etcd,rnaveiras/etcd,ajityagaty/etcd,fanminshi/etcd,vimalk78/etcd,sebrandon1/etcd,sebrandon1/etcd,lorneli/etcd,xiang90/etcd,li-ang/etcd,mqliang/etcd