[Refactor] Remove duplicate `find_free_port` (#20333)

Signed-off-by: yewentao256 <zhyanwentao@126.com>

tests/kernels/moe/utils.py

@@ -14,7 +14,7 @@ from torch.multiprocessing import (
     spawn)  # pyright: ignore[reportPrivateImportUsage]
 from typing_extensions import Concatenate, ParamSpec
 
-from vllm.model_executor.layers.fused_moe.utils import find_free_port
+from vllm.utils import get_open_port
 
 has_deep_ep = importlib.util.find_spec("deep_ep") is not None
 if has_deep_ep:
@@ -95,7 +95,7 @@ def parallel_launch(
             world_size,
             world_size,
             0,
-            f"tcp://{os.getenv('LOCALHOST', 'localhost')}:{find_free_port()}",
+            f"tcp://{os.getenv('LOCALHOST', 'localhost')}:{get_open_port()}",
             worker,
         ) + args,
         nprocs=world_size,

vllm/model_executor/layers/fused_moe/utils.py

 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
-import socket
-from contextlib import closing
 from math import prod
 from typing import Optional
 
@@ -98,10 +96,3 @@ def _fp8_perm(m: torch.Tensor, idx: torch.Tensor) -> torch.Tensor:
         return m.view(dtype=torch.uint8)[idx, ...].view(dtype=m.dtype)
     else:
         return m[idx, ...]
-
-
-def find_free_port():
-    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
-        s.bind(('', 0))
-        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        return s.getsockname()[1]