![Andreas Jaeger](/assets/img/avatar_default.png)
The repo is Python 3 now, so update hacking to version 3.0 which supports Python 3. Fix problems found by updated hacking version. Remove hacking and friends from lower-constraints, they are not needed for co-installing. Change-Id: Ibef3bbaceb61612d678c542bc8c95da24a7e2c87