Comment 0 for bug 1735160

As part of allowing Ubuntu users to enable canonical-livepatch from software-properties GUI (https://wiki.ubuntu.com/SoftwareUpdates#Update_settings) we need to backport python3-macaroonbakery 0.0.6-1 [universe] from bionic. This will requires quite few changes:

- backport httmock 1.2.6-1 [universe] from bionic - no httmock in xenial
- backport pymacaroons 0.12.0-1 [universe] from bionic - xenial has 0.9.2-0ubuntu1
- backport python-nacl 1.1.2-1 [universe] from bionic - xenial has 1.0.1-1build1
- SRU some changes in google-apputils-python - I will handle this in an SRU bug report
- add python3-protobuf to python-protobuf 2.6.1-1.3 - Right now the python3 package is not built.