Fix PEP8 issues.
Fix PEP8 issues.

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

Change-Id: I7cc284a0155d531d3890941f8c62c04f54d1a2d6

guptaankita/python-novaclient,JioCloud/python-novaclient,citrix-openstack-build/python-novaclient,CCI-MOC/python-novaclient,JioCloud/python-novaclient,takeshineshiro/python-novaclient,mat128/python-novaclient,ntt-sic/python-novaclient,akash1808/python-novaclient,Shihta/python-novaclient,Shihta/python-novaclient,akash1808/python-novaclient,metacloud/python-novaclient,citrix-openstack-build/python-novaclient,ntt-sic/python-novaclient,CCI-MOC/python-novaclient,takeshineshiro/python-novaclient,mat128/python-novaclient,guptaankita/python-novaclient,metacloud/python-novaclient