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/EventService/Subscriptions/index.json

@@ -0,0 +1,8 @@
+{
+ "@odata.context": "/redfish/v1/$metadata#EventDestinationCollection.EventDestinationCollection",
+ "@odata.id": "/redfish/v1/EventService/Subscriptions",
+ "@odata.type": "#EventDestinationCollection.EventDestinationCollection",
+ "Members": [],
+ "Members@odata.count": 0,
+ "Name": "Event Subscriptions Collection"
+}

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

@@ -0,0 +1,38 @@
+{
+ "@odata.context": "/redfish/v1/$metadata#EventService.EventService",
+ "@odata.id": "/redfish/v1/EventService",
+ "@odata.type": "#EventService.v1_1_0.EventService",
+ "Actions": {
+  "#EventService.SubmitTestEvent": {
+   "EventType@Redfish.AllowableValues": [
+    "StatusChange",
+    "ResourceUpdated",
+    "ResourceAdded",
+    "ResourceRemoved",
+    "Alert"
+   ],
+   "target": "/redfish/v1/EventService/Actions/EventService.SubmitTestEvent"
+  },
+  "Oem": {}
+ },
+ "DeliveryRetryAttempts": 3,
+ "DeliveryRetryIntervalSeconds": 60,
+ "EventTypesForSubscription": [
+  "StatusChange",
+  "ResourceUpdated",
+  "ResourceAdded",
+  "ResourceRemoved",
+  "Alert"
+ ],
+ "Id": "EventService",
+ "Name": "Event Service",
+ "Oem": {},
+ "ServiceEnabled": true,
+ "Status": {
+  "Health": "OK",
+  "State": "Enabled"
+ },
+ "Subscriptions": {
+  "@odata.id": "/redfish/v1/EventService/Subscriptions"
+ }
+}