update sheepdog storage module to 0.8
update sheepdog storage module to 0.8

- collie command is now 'dog'
- KB size is now k
- snapshot rollback need force -f flag, to avoid confirm prompt

Signed-off-by: Alexandre Derumier <13185937915d179747cf9ef6fd2470b99fe66123@odiso.com>

odiso/proxmox-pve-storage-netapp