Began integration with ONOS discovery code by implementing add switch and add link

Change-Id: I21426ea7031df20701d186cb2840a380fa334728

Made NetworkGraphModule to provide access to the global NetworkGraph instance

Change-Id: Ie2293b97f9fb6bdeaa5140c244a21c107d5e1ca7
diff --git a/src/main/java/net/onrc/onos/ofcontroller/topology/TopologyManager.java b/src/main/java/net/onrc/onos/ofcontroller/topology/TopologyManager.java
index f326f4c..bf2fd6f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/topology/TopologyManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/topology/TopologyManager.java
@@ -14,7 +14,7 @@
 import net.onrc.onos.datagrid.IDatagridService;
 import net.onrc.onos.graph.DBOperation;
 import net.onrc.onos.graph.GraphDBManager;
-import net.onrc.onos.ofcontroller.floodlightlistener.INetworkGraphService;
+import net.onrc.onos.ofcontroller.networkgraph.INetworkGraphService;
 import net.onrc.onos.ofcontroller.topology.web.OnosTopologyWebRoutable;
 import net.onrc.onos.ofcontroller.util.DataPath;
 import net.onrc.onos.ofcontroller.util.FlowEntry;
@@ -141,7 +141,6 @@
 	Collection<Class<? extends IFloodlightService>> l =
 	    new ArrayList<Class<? extends IFloodlightService>>();
 	l.add(IFloodlightProviderService.class);
-	l.add(INetworkGraphService.class);
 	l.add(IDatagridService.class);
         return l;
     }