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

Change-Id: Id2b25fb071bb20541db3f77b7afefe886520538e
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStoreTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStoreTest.java
index 4ecb8db..897a648 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStoreTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStoreTest.java
@@ -32,7 +32,7 @@
 import org.onlab.onos.store.hz.StoreService;
 import org.onlab.onos.store.hz.TestStoreManager;
 import org.onlab.onos.store.serializers.KryoSerializer;
-import org.onlab.packet.IpPrefix;
+import org.onlab.packet.IpAddress;
 
 import com.google.common.collect.Sets;
 import com.hazelcast.config.Config;
@@ -47,7 +47,7 @@
     private static final DeviceId DID2 = DeviceId.deviceId("of:02");
     private static final DeviceId DID3 = DeviceId.deviceId("of:03");
 
-    private static final IpPrefix IP = IpPrefix.valueOf("127.0.0.1");
+    private static final IpAddress IP = IpAddress.valueOf("127.0.0.1");
 
     private static final NodeId N1 = new NodeId("node1");
     private static final NodeId N2 = new NodeId("node2");