no more busyloops in stub plugins

kvmd/aiotools.py

@@ -104,6 +104,11 @@ def run_sync(coro: Coroutine[Any, Any, _RetvalT]) -> _RetvalT:
     return asyncio.get_event_loop().run_until_complete(coro)
 
 
+# =====
+async def wait_infinite() -> None:
+    await asyncio.get_event_loop().create_future()
+
+
 # =====
 @contextlib.asynccontextmanager
 async def unlock_only_on_exception(lock: asyncio.Lock) -> AsyncGenerator[None, None]: