Get InvalidStateError from asyncio directly

[hroncok]

Apparently, this exception is available from asyncio, not asyncio.futures (that was merely a leaking import):

$ python3.7 -c 'import asyncio; asyncio.futures.InvalidStateError'
$ python3.8 -c 'import asyncio; asyncio.futures.InvalidStateError'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: module 'asyncio.futures' has no attribute 'InvalidStateError'

$ python3.8 -c 'import asyncio; asyncio.InvalidStateError'
$ python3.7 -c 'import asyncio; asyncio.InvalidStateError'
$ python3.6 -c 'import asyncio; asyncio.InvalidStateError'
$ python3.5 -c 'import asyncio; asyncio.InvalidStateError'
$ python3.4 -c 'import asyncio; asyncio.InvalidStateError'

See also https://bugzilla.redhat.com/show_bug.cgi?id=1705459