Use pytest-asyncio auto mode

tests/compute/builtin/nodes/test_cloud.py

@@ -17,7 +17,6 @@
 
 import uuid
 import pytest
-import pytest_asyncio
 from unittest.mock import MagicMock, patch, call
 
 from gns3server.compute.builtin.nodes.cloud import Cloud
@@ -31,7 +30,7 @@ def nio():
     return NIOUDP(4242, "127.0.0.1", 4343)
 
 
-@pytest_asyncio.fixture
+@pytest.fixture
 async def manager():
 
     m = MagicMock()