Fix PEP8 issues.
Fix PEP8 issues.

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

Change-Id: I44f8152de76ae217d1dd81c9c0c1b1e075ec8792

varunarya10/python-glanceclient,klmitch/python-glanceclient,JioCloud/python-glanceclient,metacloud/python-glanceclient,openstack/python-glanceclient,metacloud/python-glanceclient,klmitch/python-glanceclient,varunarya10/python-glanceclient,JioCloud/python-glanceclient,alexpilotti/python-glanceclient,citrix-openstack-build/python-glanceclient,ntt-sic/python-glanceclient,mmasaki/python-glanceclient,openstack/python-glanceclient,ntt-sic/python-glanceclient,alexpilotti/python-glanceclient,citrix-openstack-build/python-glanceclient,mmasaki/python-glanceclient