Added outline of the path taken through the NetworkGraph by an event generated from the discovery modules

Change-Id: Id875f54f522e3a9135e1a7e9a989167ca532a7a5
diff --git a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/INetworkGraphService.java b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/INetworkGraphService.java
index cef80ad..318c0f7 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/INetworkGraphService.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/INetworkGraphService.java
@@ -19,5 +19,5 @@
      * applications/modules that shouldn't touch it
      * @return
      */
-    public NetworkGraphDatastore getSouthboundNetworkGraph();
+    public NetworkGraphDiscoveryInterface getNetworkGraphDiscoveryInterface();
 }