treewide: machine -> nodes.machine

nixos/tests/predictable-interface-names.nix

@@ -16,7 +16,7 @@ in pkgs.lib.listToAttrs (builtins.map ({ predictable, withNetworkd }: {
     name = "${if predictable then "" else "un"}predictableInterfaceNames${if withNetworkd then "-with-networkd" else ""}";
     meta = {};
 
-    machine = { lib, ... }: {
+    nodes.machine = { lib, ... }: {
       networking.usePredictableInterfaceNames = lib.mkForce predictable;
       networking.useNetworkd = withNetworkd;
       networking.dhcpcd.enable = !withNetworkd;