Inheritance: Akka.Remote.TestKit.MultiNodeConfig
 protected ClusterSingletonManagerStartupSpec(ClusterSingletonManagerStartupConfig config) : base(config)
 {
     _config = config;
     EchoProxy = new Lazy<IActorRef>(() => Sys.ActorOf(ClusterSingletonProxy.Props(
         singletonManagerPath: "/user/echo",
         settings: ClusterSingletonProxySettings.Create(Sys)),
         name: "echoProxy"));
 }
 protected ClusterSingletonManagerStartupSpec(ClusterSingletonManagerStartupConfig config) : base(config)
 {
     _config   = config;
     EchoProxy = new Lazy <IActorRef>(() => Sys.ActorOf(ClusterSingletonProxy.Props(
                                                            singletonManagerPath: "/user/echo",
                                                            settings: ClusterSingletonProxySettings.Create(Sys)),
                                                        name: "echoProxy"));
 }