Upgrade dev dependencies and fix issues after upgrading to pytest-aiohttp v1.0.4

tests/compute/test_base_node.py

@@ -18,7 +18,7 @@
 from collections import OrderedDict
 
 import pytest
-import asyncio
+import pytest_asyncio
 
 from tests.utils import asyncio_patch, AsyncioMagicMock
 
@@ -29,8 +29,8 @@ from gns3server.compute.vpcs import VPCS
 from gns3server.compute.nios.nio_udp import NIOUDP
 
 
-@pytest.fixture(scope="function")
-async def manager(loop, port_manager):
+@pytest_asyncio.fixture(scope="function")
+async def manager(port_manager):
 
     m = VPCS.instance()
     m.port_manager = port_manager