Code review comment for lp://staging/~jelmer/loggerhead/drop-python3

> Same comment as in https://code.launchpad.net/~jelmer/loggerhead/fix-
> tox/+merge/411874 - could you adjust this to keep Python 3.5? I'll need to
> merge these two together, since something (probably a Breezy release or
> similar) has broken the Python 2 tests.
>
> We'll need to upgrade Launchpad to Breezy >= 3.1, but that should be
> manageable now.
Done.