Apart of making pep8 version standard across all openstack
projects.
Also fix tools/hacking.py so it is compliant for pep8 1.2
and beyond, taken from fbc4568 in the nova tree.
Change-Id: I801c98a01960fa113dae1b6174c1a06bb149fea3
Signed-off-by: Chuck Short <chuck.short@canonical.com>