Modifying packaging to make the DHCP GUI work from WAR bundle-style packaging.

Change-Id: I1b9685fa1eebcac63ad41bc60db1f98b30aba656
diff --git a/apps/dhcp/src/main/java/org/onosproject/dhcp/DHCPService.java b/apps/dhcp/src/main/java/org/onosproject/dhcp/DHCPService.java
index 238da01..f40452a 100644
--- a/apps/dhcp/src/main/java/org/onosproject/dhcp/DHCPService.java
+++ b/apps/dhcp/src/main/java/org/onosproject/dhcp/DHCPService.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Open Networking Laboratory
+ * Copyright 2015 Open Networking Laboratory
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,7 +30,7 @@
      *
      * @return collection of mappings.
      */
-    Map<MacAddress, Ip4Address> listMapping();
+    Map<MacAddress, IPAssignment> listMapping();
 
     /**
      * Returns the default lease time granted by the DHCP Server.