Added unit tests for the event abstractions.
Added Element as the notion of common ancestry between Device and Host.
diff --git a/net/api/src/main/java/org/onlab/onos/net/Device.java b/net/api/src/main/java/org/onlab/onos/net/Device.java
index 700654f..9e6018e 100644
--- a/net/api/src/main/java/org/onlab/onos/net/Device.java
+++ b/net/api/src/main/java/org/onlab/onos/net/Device.java
@@ -1,11 +1,9 @@
package org.onlab.onos.net;
-import org.onlab.onos.net.provider.Provided;
-
/**
* Representation of a network infrastructure device.
*/
-public interface Device extends Provided {
+public interface Device extends Element {
/**
* Coarse classification of the type of the infrastructure device.