Fix addr reuse in check_port (#253)

python/sglang/srt/utils.py

@@ -103,6 +103,7 @@ def alloc_usable_network_port(num, used_list=()):
 def check_port(port):
     with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
         try:
+            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
             s.bind(("", port))
             return True
         except socket.error: