Setup Json Serializers for Topology classes.
Add the appropriate annotation to specify the Json serializer for each
class; Device, Link, Port, Switch

Change-Id: I83fd36afc2ae58c7fef4e928ee0081f89c5d4c98
diff --git a/src/main/java/net/onrc/onos/core/topology/Device.java b/src/main/java/net/onrc/onos/core/topology/Device.java
index 8da4e36..4d0c266 100644
--- a/src/main/java/net/onrc/onos/core/topology/Device.java
+++ b/src/main/java/net/onrc/onos/core/topology/Device.java
@@ -1,6 +1,8 @@
 package net.onrc.onos.core.topology;
 
 import net.floodlightcontroller.util.MACAddress;
+import net.onrc.onos.core.topology.serializers.DeviceSerializer;
+import org.codehaus.jackson.map.annotate.JsonSerialize;
 
 /**
  * Interface of Device Object exposed to the "NB" read-only Topology.
@@ -10,6 +12,7 @@
  * Everything returned by these interfaces must be either Unmodifiable view,
  * immutable object, or a copy of the original "SB" In-memory Topology.
  */
+@JsonSerialize(using = DeviceSerializer.class)
 public interface Device {
     /**
      * Get the device MAC address.