Refactored the HostStore to allow multiple MAC addresses bound to a single port

Change-Id: Icd3b2e483b15486251ac1cca107478a012d1a3e7
diff --git a/core/api/src/test/java/org/onlab/onos/net/host/HostServiceAdapter.java b/core/api/src/test/java/org/onlab/onos/net/host/HostServiceAdapter.java
index a0a0e36..03a8a43 100644
--- a/core/api/src/test/java/org/onlab/onos/net/host/HostServiceAdapter.java
+++ b/core/api/src/test/java/org/onlab/onos/net/host/HostServiceAdapter.java
@@ -95,7 +95,7 @@
     }
 
     @Override
-    public PortAddresses getAddressBindingsForPort(ConnectPoint connectPoint) {
+    public Set<PortAddresses> getAddressBindingsForPort(ConnectPoint connectPoint) {
         return null;
     }