Some projects (Neutron) seem to be affected more than others, so we should revert this
to allow for a more selective choice of the DB driver on a per project basis.
We can re-enable the use MySQL-python just for Neutron.
This reverts commit de8d29ed8c.
Related-Bug: #1464612
Change-Id: I889f4f8b116c413b300ab9eecc7b428a9a4afb1a