return correct disk usage info

Return disk usage information about partition
with default vm folder.
setup.py: format code to make flake8 happpy
utils/add-ez-image.py: format code to make flake8 happy
pcs_firewall.py: format code to make flake8 happy
pcsnovadriver/neutron/__init__.py: remove vi config line
volume.py: format code to make flake8 happy
vif.py: format code to make flake8 happy
utils.py: format code to make flake8 happy
template.py: format code to make flake8 happy
imagecache.py: format code to make flake8 happy
driver.py: format code to make flake8 happy