No, it's not.  The 'uuid' is a reference to the actual secret (its name, if you will) that virsh uses to store it.  Normally virsh comes up with a random UUID which is a sod to sneak into the cinder config, but this UUID isn't the actual secret; that's still generated on the mon.0 at present and propagated with storedconfig via ceph::key.

(Probably it should be generated before running puppet on the bootserver and embedded in site.pp, but same thing applies - the UUID is not the secret.)