feat(cluster): add default clustering feature

broker/src/main/java/io/moquette/interception/HazelcastInterceptHandler.java

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+package io.moquette.interception;
+
+import com.hazelcast.core.HazelcastInstance;
+import com.hazelcast.core.ITopic;
+import io.moquette.interception.messages.InterceptPublishMessage;
+import io.moquette.server.Server;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Created by mackristof on 28/05/2016.
+ */
+public class HazelcastInterceptHandler extends AbstractInterceptHandler {
+
+    private static final Logger LOG = LoggerFactory.getLogger(HazelcastInterceptHandler.class);
+    private final HazelcastInstance hz;
+
+
+    public HazelcastInterceptHandler (Server server){
+        this.hz = server.getHazelcastInstance();
+    }
+
+
+
+    @Override
+    public void onPublish(InterceptPublishMessage msg) {
+        LOG.info(String.format("%s publish on %s message : %s\n", msg.getClientID(), msg.getTopicName(), new String(msg.getPayload().array())));
+        ITopic<HazelcastMsg> topic = hz.getTopic("moquette");
+        HazelcastMsg hazelcastMsg = new HazelcastMsg(msg.getClientID(),msg.getTopicName(), msg.getQos().byteValue(), msg.getPayload().array(), msg.getUsername());
+        topic.publish(hazelcastMsg);
+    }
+
+}

broker/src/main/java/io/moquette/interception/HazelcastMsg.java

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+package io.moquette.interception;
+
+import java.io.Serializable;
+
+/**
+ * Created by mackristof on 28/05/2016.
+ */
+public class HazelcastMsg implements Serializable{
+
+    private final String clientId;
+    private final String userName;
+    private final byte qos;
+    private final String payload;
+    private final String topic;
+
+    public HazelcastMsg(String clientId, String topic , byte qos, byte[] payload, String userName) {
+        this.clientId = clientId;
+        this.qos = qos;
+        this.payload = new String(payload);
+        this.userName = userName;
+        this.topic = topic;
+    }
+
+
+    public String getClientId() {
+        return clientId;
+    }
+
+    public byte getQos() {
+        return qos;
+    }
+
+    public String getPayload() {
+        return payload;
+    }
+
+    public String getUserName() {
+        return userName;
+    }
+
+    public String getTopic() {
+        return topic;
+    }
+}