e2e: add "spawnWithExpectLines"
e2e: add "spawnWithExpectLines"

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

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