Add hook to restore loopback LVM on reboot

Otherwise when using a file-backed LVM, the volumes are lost
after a reboot.
Rados/rbd support for Cinder Volumes
Insert EOL properly
Merge pull request #77 from dirkmueller/cinder_rbd

https://github.com/crowbar/barclamp-cinder/pull/77

Merged by devtool for ArkadyKanevsky
Merge pull request #72 from dirkmueller/loopback_lvm

Fix loopback LVM case
Merge pull request #82 from dirkmueller/release/pebbles/master

Insert EOL properly