fix: read a Supermicro X10 with only the OOB license over Redfish (0.3.1)

First run against real hardware over Redfish: an X10DRL-i (BMC 3.91) with
SFT-OOB-LIC. Its Redfish tree is recorded under
tests/fixtures/supermicro-x10drl-i-3.91/redfish, scrubbed.

- A resource refused for want of a further license (403 OemLicenseNotPassed)
  no longer fails the getter. Storage then falls back to SimpleStorage. The
  firmware list falls back to the BMC and BIOS versions when UpdateService
  is withheld.
- get_device_warnings reports bmc_license_partial with the licenses and the
  withheld parts (drives, firmware inventory).
- A placeholder system model ("Super Server") is replaced by the board
  (PartNumber, else the chassis model).

tests/fixtures/supermicro-x10drl-i-3.91/redfish/index.json

@@ -0,0 +1,45 @@
+{
+ "@odata.context": "/redfish/v1/$metadata#ServiceRoot.ServiceRoot",
+ "@odata.id": "/redfish/v1/",
+ "@odata.type": "#ServiceRoot.v1_1_0.ServiceRoot",
+ "AccountService": {
+  "@odata.id": "/redfish/v1/AccountService"
+ },
+ "Chassis": {
+  "@odata.id": "/redfish/v1/Chassis"
+ },
+ "EventService": {
+  "@odata.id": "/redfish/v1/EventService"
+ },
+ "Id": "RootService",
+ "JsonSchemas": {
+  "@odata.id": "/redfish/v1/JsonSchemas"
+ },
+ "Links": {
+  "Sessions": {
+   "@odata.id": "/redfish/v1/SessionService/Sessions"
+  }
+ },
+ "Managers": {
+  "@odata.id": "/redfish/v1/Managers"
+ },
+ "Name": "Root Service",
+ "Oem": {},
+ "RedfishVersion": "1.0.1",
+ "Registries": {
+  "@odata.id": "/redfish/v1/Registries"
+ },
+ "SessionService": {
+  "@odata.id": "/redfish/v1/SessionService"
+ },
+ "Systems": {
+  "@odata.id": "/redfish/v1/Systems"
+ },
+ "Tasks": {
+  "@odata.id": "/redfish/v1/TaskService"
+ },
+ "UUID": "00000000-0000-0000-0000-00005E005313",
+ "UpdateService": {
+  "@odata.id": "/redfish/v1/UpdateService"
+ }
+}