* Use pytest-asyncio in auto mode
Remove overly genereric `pytestmark=pytest.mark.asyncio` causing lots of warning noise
* Use "Factories as Fixtures" test pattern for the `create_redis` fixture
this fixture is now async, avoiding teardown problems with missing event loops.
* Fix sporadic error on fast event loops, such as `--uvloop`
* Close connection, even if "username" was in kwargs
This fixes a resource usage warning in the async unittests.
* Do async cleanup of acl passwords via a fixture
* Remove unused import, fix whitespace
* Fix test with missing "await"
* Close pubsub objects after use in unittest
Use a simple fixture where possible, otherwise manually call pubsub.close()
* re-introduce `pytestmark=pytest.mark.asyncio` for python 3.6
* Use context manager to clean up connections in connection pool for unit tests
* Provide asynccontextmanager for python 3.6
* make `test_late_subscribe()` more robuste
* Catch a couple of additional leaked resources