Idempotency tests

[lpabon]

Tasks:

• Volume
  • Create
  • Clone - same create
  • Delete - check first
  • Update - always process
  • SnapshotCreate - same create
  • SnapshotRestore - always process
  • Attach - check
  • Detach - check
  • Mount - check
  • Unmount -check
• CloudBackup - idepontency in driver (top layers)
  • Create - If one already running it should return SUCCESS or something else?
  • Restore
  • Delete
  • DeleteAll