scripts/qapi: minor delinting

Get isort and pylint tools passing again.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20220211183650.2946895-1-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Comment explaining good-names-rgxs tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>