The pinned versions of webob and hacking weren't functioning properly
with modern Python, so they are unpinned.
Unpinning hacking brought a number of extra rules into use, so this
commit also contains a number of code style fixes.
There was also an incompatibility in the test_setup.sh script, which
meant it doesn't work with MySQL 8.0 (which is in Ubuntu 20.04). This
is also fixed in this commit.
Change-Id: I0889bc35f8babfeec42f6f577d302bb5fbce1c95
983bb8e2d7