GOSSIP-13 Add two way protocol

src/main/java/org/apache/gossip/udp/UdpActiveGossipMessage.java

@@ -0,0 +1,31 @@
+package org.apache.gossip.udp;
+
+import org.apache.gossip.model.ActiveGossipMessage;
+
+public class UdpActiveGossipMessage extends ActiveGossipMessage implements Trackable {
+
+  private String uriFrom;
+  private String uuid;
+  
+  public String getUriFrom() {
+    return uriFrom;
+  }
+  
+  public void setUriFrom(String uriFrom) {
+    this.uriFrom = uriFrom;
+  }
+  
+  public String getUuid() {
+    return uuid;
+  }
+  
+  public void setUuid(String uuid) {
+    this.uuid = uuid;
+  }
+
+  @Override
+  public String toString() {
+    return "UdpActiveGossipMessage [uriFrom=" + uriFrom + ", uuid=" + uuid + "]";
+  }
+  
+}