Remove samples (#22288)

Add code, that was used for documentation to the appropriate projects
or akka-docs.

akka-docs/rst/java/code/docs/cluster/StatsSampleOneMasterClientMain.java

@@ -0,0 +1,19 @@
+package docs.cluster;
+
+import com.typesafe.config.ConfigFactory;
+
+import akka.actor.ActorSystem;
+import akka.actor.Props;
+
+public class StatsSampleOneMasterClientMain {
+
+  public static void main(String[] args) {
+    // note that client is not a compute node, role not defined
+    ActorSystem system = ActorSystem.create("ClusterSystem",
+        ConfigFactory.load("stats2"));
+    system.actorOf(Props.create(StatsSampleClient.class, "/user/statsServiceProxy"),
+        "client");
+
+  }
+
+}