CA-220506: Update rbac role for SR.scan API call.

Allow VM_POWER_ADMIN to perform `SR.scan` in order to allow
Storage XenMotion.
VM_POWER_ADMIN can perform `VDI.create` and other VDI operations
so its safe to perform `SR.scan`.

Signed-off-by: Sharad Yadav <[email protected]>

Author: sharady

ocaml/idl/datamodel.ml

@@ -3667,7 +3667,7 @@ let sr_scan = call
     ~in_product_since:rel_rio
     ~doc:"Refreshes the list of VDIs associated with an SR"
     ~params:[Ref _sr, "sr", "The SR to scan" ]
-    ~allowed_roles:_R_POOL_OP
+    ~allowed_roles:_R_VM_POWER_ADMIN
     ()
 
 (* Nb, although this is a new explicit call, it's actually been in the API since rio - just autogenerated. So no setting of rel_miami. *)