TT#14008 websockets test: expose the real problem when connecting

related to #1497 #1549

> ======================================================================
> ERROR: setUpClass (__main__.TestWSJanus)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File "/code/t/auto-daemon-tests-websocket.py", line 114, in setUpClass
>     eventloop.run_until_complete(get_ws(cls, "janus-protocol"))
>   File "/usr/lib/python3.10/asyncio/base_events.py", line 646, in run_until_complete
>     return future.result()
>   File "/code/t/auto-daemon-tests-websocket.py", line 23, in get_ws
>     cls._ws = await connect(
>   File "/usr/lib/python3/dist-packages/websockets/legacy/client.py", line 622, in __await_impl__
>     transport, protocol = await self._create_connection()
>   File "/usr/lib/python3.10/asyncio/base_events.py", line 1089, in create_connection
>     transport, protocol = await self._create_connection_transport(
>   File "/usr/lib/python3.10/asyncio/base_events.py", line 1107, in _create_connection_transport
>     protocol = protocol_factory()
>   File "/usr/lib/python3/dist-packages/websockets/legacy/client.py", line 160, in __init__
>     super().__init__(**kwargs)
>   File "/usr/lib/python3/dist-packages/websockets/legacy/protocol.py", line 154, in __init__
>     self._drain_lock = asyncio.Lock(
>   File "/usr/lib/python3.10/asyncio/locks.py", line 78, in __init__
>     super().__init__(loop=loop)
>   File "/usr/lib/python3.10/asyncio/mixins.py", line 17, in __init__
>     raise TypeError(
> TypeError: As of 3.10, the *loop* parameter was removed from Lock() since it is no longer necessary
>
> ----------------------------------------------------------------------

Change-Id: I3178c54ed7eb40b9cc06769c1f1e237e0d58f966

t/auto-daemon-tests-websocket.py

@@ -11,7 +11,7 @@ import traceback
 import unittest
 import uuid
 
-import websockets
+from websockets import connect
 
 
 eventloop = None
@@ -20,11 +20,11 @@ eventloop = None
 async def get_ws(cls, proto):
     for _ in range(1, 300):
         try:
-            cls._ws = await websockets.connect(
+            cls._ws = await connect(
                 "ws://127.0.0.1:9191/", subprotocols=[proto]
             )
             break
-        except:
+        except FileNotFoundError:
             await asyncio.sleep(0.1)