Log unhandled loop exception traces when asyncio debug is on

[bdraco]

Before

2021-10-12 23:01:57 ERROR (MainThread) [homeassistant] Error doing job: Unclosed client session

After

2021-10-12 23:01:57 ERROR (MainThread) [homeassistant] Error doing job: Unclosed client session:   File "/Users/bdraco/home-assistant/venv/bin/hass", line 33, in <module>
    sys.exit(load_entry_point('homeassistant', 'console_scripts', 'hass')())
  File "/Users/bdraco/home-assistant/homeassistant/__main__.py", line 318, in main
    exit_code = runner.run(runtime_conf)
  File "/Users/bdraco/home-assistant/homeassistant/runner.py", line 122, in run
    return loop.run_until_complete(setup_and_run_hass(runtime_config))
  File "/opt/homebrew/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/base_events.py", line 629, in run_until_complete
    self.run_forever()
  File "/opt/homebrew/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/base_events.py", line 596, in run_forever
    self._run_once()
  File "/opt/homebrew/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/base_events.py", line 1882, in _run_once
    handle._run()
  File "/opt/homebrew/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/Users/bdraco/home-assistant/homeassistant/data_entry_flow.py", line 191, in _async_init
    result = await self._async_handle_step(flow, flow.init_step, data, init_done)
  File "/Users/bdraco/home-assistant/homeassistant/data_entry_flow.py", line 270, in _async_handle_step
    result: FlowResult = await getattr(flow, method)(user_input)
  File "/Users/bdraco/home-assistant/homeassistant/components/harmony/config_flow.py", line 103, in async_step_ssdp
    await connector._get_remote_id()
  File "/Users/bdraco/home-assistant/venv/lib/python3.9/site-packages/aioharmony/hubconnector_websocket.py", line 105, in _get_remote_id
    response = await self._retrieve_hub_info()
  File "/Users/bdraco/home-assistant/venv/lib/python3.9/site-packages/aioharmony/hubconnector_websocket.py", line 427, in _retrieve_hub_info
    response = await self.hub_post(url, json_request, headers)
  File "/Users/bdraco/home-assistant/venv/lib/python3.9/site-packages/aioharmony/hubconnector_websocket.py", line 322, in hub_post
    async with self._session.post(
  File "/Users/bdraco/home-assistant/venv/lib/python3.9/site-packages/aioharmony/hubconnector_websocket.py", line 96, in _session
    self._aiohttp_session = aiohttp.ClientSession(connector=conn,

Breaking change

Proposed change

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

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[balloob]

Yes, that's a lot more helpful! :)