
The repo is Python 3 now, so update hacking to version 3.0 which supports Python 3. Fix problems found. Remove hacking and friends from lower-constraints, they are not needed for installation. Change-Id: Ia16e8cbccf7b38be8909aa94e66c04b99f200b89 (cherry picked from commit 2ebc766534eba6163e98b94a1f114ece18739fff)