ONOS-2197 Adding some logic to keep track of expired IP Lease Assignments

Change-Id: I330e5fbf790f0a4fe72f1fbce272617837225e64
diff --git a/onos-app-dhcpserver/src/main/java/org/onosproject/dhcpserver/DHCPStore.java b/onos-app-dhcpserver/src/main/java/org/onosproject/dhcpserver/DHCPStore.java
index b6c60a2..29cb277 100644
--- a/onos-app-dhcpserver/src/main/java/org/onosproject/dhcpserver/DHCPStore.java
+++ b/onos-app-dhcpserver/src/main/java/org/onosproject/dhcpserver/DHCPStore.java
@@ -31,7 +31,7 @@
      * @param macID Mac ID of the client requesting an IP
      * @return IP address assigned to the Mac ID
      */
-    Ip4Address suggestIP(MacAddress macID);
+    Ip4Address suggestIP(MacAddress macID, Ip4Address requestedIP);
 
     /**
      * Assigns the requested IP to the Mac ID, in response to a DHCP REQUEST message.