CP-26340: SR.probe changes

SMAPIv3 returns a list of configurations:
* suitable for SR.attach together with sr_info
* suitable for SR.create
* suitable as further input to SR.probe (recursively)

SMAPIv1 is unaffected, it always returns a `Raw` result.

Signed-off-by: Edwin Török <edvin.torok@citrix.com>

storage/storage_interface.ml

@@ -118,9 +118,11 @@ type dp_stat_t = {
 
 let string_of_dp_stat_t (x: dp_stat_t) = Jsonrpc.to_string (rpc_of_dp_stat_t x)
 
+type device_config = (string * string) list
 type probe = {
-  srs: (string * sr_info) list; (* SRs we found *)
-  uris: string list; (* other uris we found which could be probed recursively *)
+  attachable: (device_config * sr_info) list; (* Attachable SRs we found *)
+  creatable: device_config list; (* Complete configurations that can be used to create an SR. *)
+  incomplete: device_config list; (* other configurations we found which could be probed recursively *)
 }
 
 type probe_result =