### Summary

The units in `test/units/plugins/strategy/test_strategy.py` have become problematic, and fail randomly due to something in the test not properly tearing down ansible.  Eventually the tests are killed in CI, and most frequently on python3.5.

See https://github.com/ansible/ansible/pull/74048

### Issue Type

Bug Report

### Component Name

test/units/plugins/strategy/test_strategy.py

### Ansible Version

```console (paste below)
$ ansible --version
2.11
```


### Configuration

```console (paste below)
$ ansible-config dump --only-changed

```


### OS / Environment

default test container, frequently with Py3.5 in CI

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```yaml (paste below)

```


### Expected Results

No hang in CI

### Actual Results

Transient hangs in CI

mock_host.has_hostkey = True
        mock_task = MagicMock()
        mock_task._role = None
        mock_task._parent = None
        mock_task.ignore_errors = False
        mock_task.ignore_unreachable = False
        mock_task._uuid = str(uuid.uuid4())
        mock_task.loop = None
        mock_task.copy.return_value = mock_task
        mock_handler_task = Handler()
        mock_handler_task.name = 'test handler'
        mock_handler_task.action = 'foo'
        mock_handler_task._parent = None
        mock_handler_task._uuid = 'xxxxxxxxxxxxx'
        mock_iterator = MagicMock()
        mock_iterator._play = mock_play
        mock_iterator.mark_host_failed.return_value = None
        mock_iterator.get_next_task_for_host.return_value = (None, None)
        mock_handler_block = MagicMock()
        mock_handler_block.block = [mock_handler_task]
        mock_handler_block.rescue = []
        mock_handler_block.always = []
        mock_play.handlers = [mock_handler_block]
        mock_group = MagicMock()
        mock_group.add_host.return_value = None
        def _get_host(host_name):
            if host_name == 'test01':
                return mock_host
            return None
        def _get_group(group_name):