nixos/test-driver: remove unused imports, add pylint unused-import check

nixos/lib/test-driver/default.nix

@@ -26,7 +26,7 @@ python3Packages.buildPythonApplication rec {
     mypy --disallow-untyped-defs \
           --no-implicit-optional \
           --ignore-missing-imports ${src}/test_driver
-    pylint --errors-only ${src}/test_driver
+    pylint --errors-only --enable=unused-import ${src}/test_driver
     black --check --diff ${src}/test_driver
   '';
 }

nixos/lib/test-driver/test_driver/machine.py

@@ -17,7 +17,6 @@ import threading
 import time
 
 from test_driver.logger import rootlog
-from test_driver.polling_condition import PollingCondition
 
 CHAR_TO_KEY = {
     "A": "shift-a",

nixos/lib/test-driver/test_driver/polling_condition.py

@@ -1,6 +1,4 @@
-from typing import Callable, Optional, Any, List, Dict
-from functools import wraps
-
+from typing import Callable, Optional
 import time
 
 from .logger import rootlog