* commit '276173163':
Add changelog entry
fix doc strings
make isort happy
add some comments
drop some logger lines to debug
make changes based on PR feedback
add function docs
use something that's the right type for user_id
run black
split out signature processing into separate functions
avoid modifying input parameter
fix test
update with newer coding style
add test
make isort happy
make black happy
allow uploading signatures of master key signed by devices
implement device signature uploading/fetching
8165d3c81d