Fix network discovery behavior

The network info was discarded instead of used.

Fixes #647

Author: AndrejMitrovic

source/agora/network/NetworkManager.d

@@ -410,6 +410,7 @@ public class NetworkManager
             try
             {
                 auto net_info = node.getNetworkInfo();
+                this.addAddresses(net_info.addresses);
                 if (net_info.state == NetworkState.Complete)
                     return;  // done
 

source/agora/test/NetworkDiscovery.d

@@ -55,16 +55,12 @@ unittest
     network.start();
     scope(exit) network.shutdown();
     scope(failure) network.printLogs();
+    network.waitForDiscovery();
 
-    try
-    {
-        network.waitForDiscovery();
-    }
-    catch (Throwable ex)
+    foreach (key, node; network.nodes)
     {
-        // discovery never reached
-        return;
+        auto addresses = node.client.getNetworkInfo().addresses.keys;
+        assert(addresses.sort.uniq.count == 3,
+               format("Node %s has %d peers: %s", key, addresses.length, addresses));
     }
-
-    assert(0);  // should not be reached
 }