API collector bot: failure on reload

[monoidic]

When reloading the collector bot, it seems that the shutdown procedures in shutdown are insufficient, as the IO loop is not properly closed. The result is an unresponsive collector, accepting connections, but not responding.

Exception in thread Thread-2:
API-Test-Collector: Bot initialization completed.
Traceback (most recent call last):
INFO:API-Test-Collector:Bot initialization completed.
  File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.8/dist-packages/tornado/platform/asyncio.py", line 199, in start
    self.asyncio_loop.run_forever()
  File "/usr/lib/python3.8/asyncio/base_events.py", line 560, in run_forever
    self._check_running()
  File "/usr/lib/python3.8/asyncio/base_events.py", line 552, in _check_running
    raise RuntimeError('This event loop is already running')
RuntimeError: This event loop is already running