Changed RPC methods. Changed Network interface.

* Nodes/Topology removed from public methods from Network interface
* Peers() returns max depth 3 topology
* handler.Topology rpc endpoint removed
* handler.Peers rpc endpoint accept "depth" param to return max depth peers

network/default.go

@@ -809,16 +809,6 @@ func (n *network) Connect() error {
 	return nil
 }
 
-// Nodes returns a list of all network nodes
-func (n *network) Nodes() []Node {
-	return n.node.Nodes()
-}
-
-// Topology returns network topology
-func (n *network) Topology() Node {
-	return n.node.Topology(MaxDepth)
-}
-
 func (n *network) close() error {
 	// stop the server
 	if err := n.server.Stop(); err != nil {