Bump hacking version to 0.9.2

Nova has bumped hacking to 0.9.x series. We should bump it to
0.9.x series. This patch also fixes the violations listed in:
https://jenkins07.openstack.org/job/gate-nova-docker-pep8/37/console

Change-Id: I73d323f15dd61347120130385d5083a957bcbeb0