Add/Deactivate Switch, Port, Link

Change-Id: Iec8d5401eef0bdb1a3cad845f78f4e8fef7de856
diff --git a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java
index 126bbab..ae955d1 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java
@@ -17,4 +17,6 @@
 
 	public Link getOutgoingLink();
 	public Link getIncomingLink();
+
+	public Iterable<Device> getDevices();
 }