Python 3.11 about shodohflo

[m3047]

So what I know:

• This project will remain Python 3.6 compatible.
• If you use shodohflo.fstrm.Server you will have to invoke listen_asyncio() as a coroutine; this will ease the transition to 3.11 and simultaneously minimizes changes elsewhere in your code.
• If you override shodohflo.fstrm.Server.run_forever() some additional work will be needed as run_forever() is going away (you will need to migrate any code).
• As a standalone, ShoDoHFlo will continue to work without breaking changes.
• Final release will occur in concert with Rear_View_RPZ, so that it too continues to work without breaking changes.
• Technically loop.run_forever() is still supported, however it takes more work and is now part of the "lower level" API.

Preview code (focusing on examples/dnstap2json.py) will be released on the fwm branch.

[m3047]

ac7faf1 on fwm contains preview code involving the following artifacts:

• shodohflo/fstrm.py
• examples/dnstap2json.py

[m3047]

ShoDoHFlo and Rear View RPZ are both upgraded at 3134275 and m3047/rear_view_rpz@190518e respectively for Python 3.11 compatibility, and should remain backwards compatible with Python 3.6.