Add getDpid() to Port interface

Change-Id: Ibb40d8af9eb5ff0003f7d7205d0fdb59c48d9632
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 753532f..91f36b9 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java
@@ -10,6 +10,7 @@
  *
  */
 public interface Port {
+	public Long getDpid();
 	public Long getNumber();
 	public Long getHardwareAddress();
 	public String getDescription();