nixosTests.hostname: migrate to runTest (#555616)

nixos/tests/all-tests.nix

@@ -813,7 +813,10 @@ in
   homer = handleTest ./homer { };
   honk = runTest ./honk.nix;
   hoogle = runTest ./hoogle.nix;
-  hostname = handleTest ./hostname.nix { };
+  hostname = import ./hostname.nix {
+    inherit pkgs runTest;
+    inherit (pkgs) lib;
+  };
   hound = runTest ./hound.nix;
   hub = runTest ./git/hub.nix;
   hydra = runTest ./hydra;

nixos/tests/hostname.nix

@@ -1,11 +1,10 @@
 {
-  system ? builtins.currentSystem,
-  config ? { },
-  pkgs ? import ../.. { inherit system config; },
+  pkgs,
+  runTest,
+  lib,
 }:
 
-with import ../lib/testing-python.nix { inherit system pkgs; };
-with pkgs.lib;
+with lib;
 
 let
   makeHostNameTest =
@@ -19,7 +18,7 @@ let
         in
         if (res.success && res.value != null) then res.value else "null";
     in
-    makeTest {
+    runTest {
       name = "hostname-${fqdn}";
       meta = with pkgs.lib.maintainers; {
         maintainers = [