@Override
    public void shutdown() {
        peer.shutdown(Duration.ofMinutes(1));
    }
ZooKeeper server. Guarantees that the server is up by writing a node to ZooKeeper successfully before
returning from constructor.

@author Ulf Lilleengen
@author Harald Musum
zookeeper-server/zookeeper-server/src/main/java/com/yahoo/vespa/zookeeper/VespaZooKeeperServerImpl.java