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

sgl-router/py_test/e2e_grpc/features/test_enable_thinking.py

@@ -6,17 +6,11 @@ python3 -m unittest openai_server.features.test_enable_thinking.TestEnableThinki
 python3 -m unittest openai_server.features.test_enable_thinking.TestEnableThinking.test_stream_chat_completion_without_reasoning
 """
 
-import asyncio
 import json
-import os
 import sys
-import time
 import unittest
-
-# CHANGE: Import router launcher instead of server launcher
 from pathlib import Path
 
-import openai
 import requests
 
 _TEST_DIR = Path(__file__).parent
@@ -24,10 +18,8 @@ sys.path.insert(0, str(_TEST_DIR.parent))
 from fixtures import popen_launch_workers_and_router
 from util import (
     DEFAULT_ENABLE_THINKING_MODEL_PATH,
-    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
     DEFAULT_URL_FOR_TEST,
     CustomTestCase,
-    get_tokenizer,
     kill_process_tree,
 )
 
@@ -131,7 +123,6 @@ class TestEnableThinking(CustomTestCase):
         has_reasoning = False
         has_content = False
 
-        print("\n=== Stream With Reasoning ===")
         for line in response.iter_lines():
             if line:
                 line = line.decode("utf-8")
@@ -176,7 +167,6 @@ class TestEnableThinking(CustomTestCase):
         has_reasoning = False
         has_content = False
 
-        print("\n=== Stream Without Reasoning ===")
         for line in response.iter_lines():
             if line:
                 line = line.decode("utf-8")