Replaced the usage of IpPrefix with IpAddress in the context of
Controller Nodes.

Change-Id: Id2b25fb071bb20541db3f77b7afefe886520538e
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/impl/ClusterNodesDelegate.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/impl/ClusterNodesDelegate.java
index daef7bd..4037050 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/impl/ClusterNodesDelegate.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/impl/ClusterNodesDelegate.java
@@ -2,7 +2,7 @@
 
 import org.onlab.onos.cluster.DefaultControllerNode;
 import org.onlab.onos.cluster.NodeId;
-import org.onlab.packet.IpPrefix;
+import org.onlab.packet.IpAddress;
 
 // Not used right now
 /**
@@ -19,7 +19,8 @@
      * @param tcpPort node TCP listen port
      * @return the controller node
      */
-    DefaultControllerNode nodeDetected(NodeId nodeId, IpPrefix ip, int tcpPort);
+    DefaultControllerNode nodeDetected(NodeId nodeId, IpAddress ip,
+                                       int tcpPort);
 
     /**
      * Notifies about cluster node going offline.