Update hacking to fix pep8 failure
Update hacking to fix pep8 failure

With the release of pbr 1.0.0, we need a newer version of hacking.
Update the version. hacking is manually synced from global
requirements repo, use the version from there.

See also
http://lists.openstack.org/pipermail/openstack-dev/2015-May/064362.html

Change-Id: Ic3ff9ad74acd57fe149e5873fefe8a99e1d701d8

vauxoo-tests/vauxoodocstheme,vauxoo-tests/vauxoodocstheme,openstack/openstackdocstheme,openstack/openstackdocstheme,vauxoo-tests/vauxoodocstheme,openstack/openstackdocstheme,openstack/openstackdocstheme