[router][CI] Clean up imports and prints statements in sgl-router/py_test (#12024)

sgl-router/py_test/integration/load_balancing/test_random.py

 import collections
-import math
 
 import pytest
 import requests

sgl-router/py_test/integration/load_balancing/test_round_robin.py

 import collections
-import time
 
 import pytest
 import requests

sgl-router/py_test/integration/test_fault_tolerance.py

-import concurrent.futures
-import subprocess
-import time
-
 import pytest
 import requests
 

sgl-router/py_test/integration/test_pd_routing.py

 import collections
 import concurrent.futures
-import subprocess
 import time
 
 import pytest

sgl-router/py_test/integration/test_rate_limiting.py

 import concurrent.futures
-import time
 
 import pytest
 import requests

sgl-router/py_test/integration/test_retries.py

-import concurrent.futures
-import subprocess
-import time
-
 import pytest
 import requests
 

sgl-router/py_test/integration/test_worker_management.py

-import collections
-import subprocess
-import time
-
 import pytest
 import requests
 

sgl-router/py_test/unit/test_arg_parser.py

@@ -5,9 +5,7 @@ These tests focus on testing the argument parsing logic in isolation,
 without starting actual router instances.
 """
 
-import argparse
 from types import SimpleNamespace
-from unittest.mock import MagicMock, patch
 
 import pytest
 from sglang_router.launch_router import RouterArgs, parse_router_args

sgl-router/py_test/unit/test_router_config.py

@@ -5,7 +5,6 @@ These tests focus on testing the router configuration logic in isolation,
 including validation of configuration parameters and their interactions.
 """
 
-from types import SimpleNamespace
 from unittest.mock import MagicMock, patch
 
 import pytest

sgl-router/py_test/unit/test_startup_sequence.py

@@ -6,8 +6,7 @@ including router initialization, configuration validation, and startup flow.
 """
 
 import logging
-from types import SimpleNamespace
-from unittest.mock import MagicMock, call, patch
+from unittest.mock import MagicMock, patch
 
 import pytest
 from sglang_router.launch_router import RouterArgs, launch_router

sgl-router/py_test/unit/test_validation.py

@@ -5,7 +5,6 @@ These tests focus on testing the validation logic in isolation,
 including parameter validation, URL validation, and configuration validation.
 """
 
-from types import SimpleNamespace
 from unittest.mock import MagicMock, patch
 
 import pytest