We have shutdown functions within the async client code but the siggen
doesn't currently call them. We notice on python 3.10 (such as on fedora35)
that at exit, there is a stray asyncio process left behind. Usually this
doesn't cause problems but it could potentially be a cause of a hang.
For general cleanliness and completness, add in hooks to call the exit handler.
(Bitbake rev: 9ee3fb95330003878fbd64b3ce8897aad96fcd0f)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
88fcf8422d