Code style fix according to flake8
Code style fix according to flake8

Change-Id: I7d7e34850a51b5d6846a4a1cfeaa0df23ad1a19c

NaohiroTamura/python-ironicclient,NaohiroTamura/python-ironicclient,openstack/python-ironicclient,openstack/python-ironicclient