The machines in the network should be accessed by the node function parameter

svn path=/nixos/trunk/; revision=27538

modules/installer/tools/nixos-deploy-network/deploy.nix

@@ -81,7 +81,7 @@ let
                 deployment.targetHost = pkgs.lib.mkOverride 900 configurationName;
               }
             ];
-          extraArgs = evaluateMachines network;
+          extraArgs = { nodes = evaluateMachines network; };
         }).config; }
     ) (attrNames (network)));