rename topology related objects: Device -> Host

- KVDevice to be renamed later.
- Use fully qualified name for topology's Host. (HostManager.java)

Change-Id: I1538f96d7ca93ca2197d23e5a69b85d284611412
diff --git a/src/main/java/net/onrc/onos/core/topology/PortImpl.java b/src/main/java/net/onrc/onos/core/topology/PortImpl.java
index c1bb75c..a4f34d5 100644
--- a/src/main/java/net/onrc/onos/core/topology/PortImpl.java
+++ b/src/main/java/net/onrc/onos/core/topology/PortImpl.java
@@ -190,10 +190,10 @@
     }
 
     @Override
-    public Iterable<Device> getDevices() {
+    public Iterable<Host> getHosts() {
         topology.acquireReadLock();
         try {
-            return topology.getDevices(this.asSwitchPort());
+            return topology.getHosts(this.asSwitchPort());
         } finally {
             topology.releaseReadLock();
         }