the value of `rbd.keyring` is protected by `creates` defined in
`get-or-set virsh secret`, with this changes, allowing system to
detect if the value of `rbd.keyring` is chnaged or not. If it's
changed puppet will regenerated with required changes, or puppet
will leave it untouched.
Change-Id: Ic683f2488123d8d751996a4ba17770d703f38e40