GossipHostStore: add AE support

- modified HostDescription family to hold Set of IpAddresses

Change-Id: Id920fdc83817802885e8528af185a5ad590bf999
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/host/impl/GossipHostStoreMessageSubjects.java b/core/store/dist/src/main/java/org/onlab/onos/store/host/impl/GossipHostStoreMessageSubjects.java
index 27cf4ce..0a9f0e0 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/host/impl/GossipHostStoreMessageSubjects.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/host/impl/GossipHostStoreMessageSubjects.java
@@ -4,6 +4,11 @@
 
 public final class GossipHostStoreMessageSubjects {
     private GossipHostStoreMessageSubjects() {}
-    public static final MessageSubject HOST_UPDATED = new MessageSubject("peer-host-updated");
-    public static final MessageSubject HOST_REMOVED = new MessageSubject("peer-host-removed");
+
+    public static final MessageSubject HOST_UPDATED
+        = new MessageSubject("peer-host-updated");
+    public static final MessageSubject HOST_REMOVED
+        = new MessageSubject("peer-host-removed");
+    public static final MessageSubject HOST_ANTI_ENTROPY_ADVERTISEMENT
+        = new MessageSubject("host-enti-entropy-advertisement");;
 }