Fix PEP8 issues.
Fix PEP8 issues.

Fix some pep8 issues in doc/source/conf.py make the code looks pretty.

Change-Id: Ib1e2f8214ad7f4bc49c8c3dfa016843f8df15fe6

darren-wang/ksc,Mercador/python-keystoneclient,alexpilotti/python-keystoneclient,klmitch/python-keystoneclient,metacloud/python-keystoneclient,ntt-sic/python-keystoneclient,magic0704/python-keystoneclient,ging/python-keystoneclient,citrix-openstack-build/python-keystoneclient,citrix-openstack-build/python-keystoneclient,dolph/python-keystoneclient,ging/python-keystoneclient,alexpilotti/python-keystoneclient,metacloud/python-keystoneclient,jamielennox/python-keystoneclient,klmitch/python-keystoneclient,citrix-openstack-build/python-keystoneclient,darren-wang/ksc,ntt-sic/python-keystoneclient,Mercador/python-keystoneclient,dolph/python-keystoneclient,sdpp/python-keystoneclient,jamielennox/python-keystoneclient,sdpp/python-keystoneclient,ntt-sic/python-keystoneclient,jamielennox/python-keystoneclient,magic0704/python-keystoneclient