Renamed OnosDevice classes to Host.

Note this change only affects the driver level Host discovery module (and
any modules that make use of it). I did not rename the Device class in
the topology module yet.

Change-Id: I38bf42b2378da736199957d05467e8407548759e
diff --git a/src/main/java/net/onrc/onos/core/hostmanager/IHostListener.java b/src/main/java/net/onrc/onos/core/hostmanager/IHostListener.java
new file mode 100644
index 0000000..2a61ab2
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/hostmanager/IHostListener.java
@@ -0,0 +1,8 @@
+package net.onrc.onos.core.hostmanager;
+
+public interface IHostListener {
+
+    public void hostAdded(Host host);
+
+    public void hostRemoved(Host host);
+}