Async in webserver

[stevehoover]

Everything about the Tornado webserver (and host C++ for that matter, but that should be filed separately) is serial. I had to upgrade to Python 3 before utilizing async functions. I did the upgrade, but not the use of async.

See:
https://docs.python.org/3/library/asyncio-task.html
https://www.tornadoweb.org/en/stable/faq.html