Added more node tests. Small refactoring of Netowkr and handler.

network/network.go

@@ -46,8 +46,8 @@ type Network interface {
 	Connect() error
 	// Nodes returns list of network nodes
 	Nodes() []Node
-	// Topology returns a list of all reachable nodes up to depth
-	Topology(depth uint) []Node
+	// Topology returns node topology up to MaxDepth hops
+	Topology() Node
 	// Close stops the tunnel and resolving
 	Close() error
 	// Client is micro client