multi: pass reset to GraphSession

routing/graph.go

@@ -29,7 +29,8 @@ type GraphSessionFactory interface {
 	// GraphSession will provide the call-back with access to a
 	// graphdb.NodeTraverser instance which can be used to perform queries
 	// against the channel graph.
-	GraphSession(cb func(graph graphdb.NodeTraverser) error) error
+	GraphSession(cb func(graph graphdb.NodeTraverser) error,
+		reset func()) error
 }
 
 // FetchAmountPairCapacity determines the maximal public capacity between two