test: output etcd server logs when functional tests fail
test: output etcd server logs when functional tests fail

Signed-off-by: Gyuho Lee <0fbd30d364d71722b926950b451cecd97b54fc29@amazon.com>

mkumatag/etcd,cockroachdb/etcd,ajityagaty/etcd,mqliang/etcd,ajityagaty/etcd,mkumatag/etcd,li-ang/etcd,ajityagaty/etcd,rnaveiras/etcd,mqliang/etcd,mkumatag/etcd,etcd-io/etcd,dannysauer/etcd,gyuho/etcd,etcd-io/etcd,coreos/etcd,gyuho/etcd,rnaveiras/etcd,dannysauer/etcd,etcd-io/etcd,coreos/etcd,li-ang/etcd,rnaveiras/etcd,mqliang/etcd,cockroachdb/etcd