LeadershipService API change: Using NodeId in place of ControllerNode.

Change-Id: I6f688506c3672977456fc6921b26e98be2239632
diff --git a/apps/sdnip/src/main/java/org/onlab/onos/sdnip/SdnIp.java b/apps/sdnip/src/main/java/org/onlab/onos/sdnip/SdnIp.java
index eddf7e4..4c81c15 100644
--- a/apps/sdnip/src/main/java/org/onlab/onos/sdnip/SdnIp.java
+++ b/apps/sdnip/src/main/java/org/onlab/onos/sdnip/SdnIp.java
@@ -167,7 +167,7 @@
             if (!event.subject().topic().equals(appId.name())) {
                 return;         // Not our topic: ignore
             }
-            if (!event.subject().leader().id().equals(
+            if (!event.subject().leader().equals(
                         localControllerNode.id())) {
                 return;         // The event is not about this instance: ignore
             }