Merge pull request #5 from vnaboychenko/master

fix cinder for NFS mounts
Merge pull request #11 from vnaboychenko/master

add cinder-backup service
Merge pull request #12 from vnaboychenko/master

add cinder backup service
Fix bug ATTS-43 if variable cinder-backup-use
is not defined
Merge pull request #15 from vnaboychenko/cinder-backup

Fix bug if variable cinder-backup-use is not defined