Fix some pep8 issues in doc/conf.py make the code looks pretty.
Change-Id: I137e42aed193eecccec7e4f4b295871c896640ba
Reviewed-on: https://review.openstack.org/12118
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins