The repo is Python 3 now, so update hacking to version 3.0.1 which
supports Python 3.
Fix problems found.
Remove hacking and friends from lower-constraints, they are not needed
for installation.
Change-Id: I6691687f0cd2fe4c9e7f2a76d333ca9eacb0cbf3
Add installation scripts for Smaug's development virtualenv.
These scripts can be used to create a virtual environment
for Smaug like the other project do.
The virtual environment could avoid multiple versions of conflict.
Change-Id: Ib5fde38bd48160e9c2e31655eecd107d6efa2ec9
Closes-Bug: #1599427