common/options: make 'rbd_validate_pool' a dev option

'rbd_validate_pool' option is for testing purposes only. So change
its level appropriately to 'dev'.

Signed-off-by: Ramana Raja <[email protected]>

Author: ajarr

src/common/options/rbd.yaml.in

@@ -394,7 +394,7 @@ options:
   - rbd
 - name: rbd_validate_pool
   type: bool
-  level: advanced
+  level: dev
   desc: validate empty pools for RBD compatibility
   default: true
   services: