Mark async fixture as such, clean up pytest DeprecationWarnings

Author: kclowes

tests/integration/conftest.py

@@ -37,7 +37,7 @@ def revert_contract_factory(web3):
     return contract_factory
 
 
-@pytest.yield_fixture(scope="module")
+@pytest.fixture(scope="module")
 def event_loop(request):
     loop = asyncio.get_event_loop_policy().new_event_loop()
     yield loop

tests/integration/go_ethereum/conftest.py

@@ -181,7 +181,7 @@ def unlockable_account_dual_type(unlockable_account, address_conversion_func):
     return address_conversion_func(unlockable_account)
 
 
-@pytest.yield_fixture
+@pytest.fixture
 def unlocked_account_dual_type(web3, unlockable_account_dual_type, unlockable_account_pw):
     web3.geth.personal.unlock_account(unlockable_account_dual_type, unlockable_account_pw)
     yield unlockable_account_dual_type

tests/integration/go_ethereum/test_goethereum_http.py

@@ -1,4 +1,5 @@
 import pytest
+import pytest_asyncio
 
 from tests.utils import (
     get_open_port,
@@ -94,7 +95,7 @@ def web3(geth_process, endpoint_uri):
     return _web3
 
 
-@pytest.fixture(scope="module")
+@pytest_asyncio.fixture(scope="module")
 async def async_w3(geth_process, endpoint_uri):
     await wait_for_aiohttp(endpoint_uri)
     _web3 = Web3(