Scality SOFS : Use ensure_tree from fileutils
Scality SOFS : Use ensure_tree from fileutils

To avoid code duplication, use fileutils.ensure_tree
from openstack/common instead of reinventing the wheel

Change-Id: If75a7c79eb063fe8987f34e8e9acc5fda97e8c6e

Paul-Ezell/cinder-1,leilihh/cinder,Hybrid-Cloud/cinder,apporc/cinder,mahak/cinder,sasukeh/cinder,Datera/cinder,dims/cinder,nexusriot/cinder,Datera/cinder,potsmaster/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,scality/cinder,apporc/cinder,takeshineshiro/cinder,j-griffith/cinder,NetApp/cinder,nexusriot/cinder,Nexenta/cinder,scottdangelo/RemoveVolumeMangerLocks,petrutlucian94/cinder,winndows/cinder,manojhirway/ExistingImagesOnNFS,takeshineshiro/cinder,Hybrid-Cloud/cinder,ge0rgi/cinder,julianwang/cinder,nikesh-mahalka/cinder,Paul-Ezell/cinder-1,j-griffith/cinder,openstack/cinder,scottdangelo/RemoveVolumeMangerLocks,cloudbase/cinder,rakeshmi/cinder,saeki-masaki/cinder,Nexenta/cinder,phenoxim/cinder,CloudServer/cinder,dims/cinder,NetApp/cinder,duhzecca/cinder,CloudServer/cinder,leilihh/cinder,nikesh-mahalka/cinder,tlakshman26/cinder-new-branch,tlakshman26/cinder-https-changes,openstack/cinder,JioCloud/cinder,eharney/cinder,tlakshman26/cinder-https-changes,saeki-masaki/cinder,cloudbase/cinder,scality/cinder,potsmaster/cinder,bswartz/cinder,bswartz/cinder,julianwang/cinder,rakeshmi/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,winndows/cinder,phenoxim/cinder,petrutlucian94/cinder,eharney/cinder,mahak/cinder,manojhirway/ExistingImagesOnNFS,tlakshman26/cinder-new-branch,JioCloud/cinder,duhzecca/cinder,sasukeh/cinder