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/Chassis/1/index.json

@@ -0,0 +1,51 @@
+{
+ "@odata.context": "/redfish/v1/$metadata#Chassis.Chassis",
+ "@odata.id": "/redfish/v1/Chassis/1",
+ "@odata.type": "#Chassis.v1_4_0.Chassis",
+ "AssetTag": "",
+ "ChassisType": "RackMount",
+ "Id": "1",
+ "IndicatorLED": "Off",
+ "Links": {
+  "ComputerSystems": [
+   {
+    "@odata.id": "/redfish/v1/Systems/1"
+   }
+  ],
+  "ManagedBy": [
+   {
+    "@odata.id": "/redfish/v1/Managers/1"
+   }
+  ]
+ },
+ "Manufacturer": "Supermicro",
+ "Model": "X10DRL-i",
+ "Name": "Computer System Chassis",
+ "Oem": {
+  "Supermicro": {
+   "@odata.type": "#SmcChassisExtensions.v1_0_0.Chassis",
+   "BoardID": "0x831",
+   "BoardSerialNumber": "ZM000S000001",
+   "GUID": "43303031-4D53-0CC4-7A72-6F1300000000"
+  }
+ },
+ "PartNumber": "",
+ "PhysicalSecurity": {
+  "IntrusionSensor": "Normal",
+  "IntrusionSensorNumber": 170,
+  "IntrusionSensorReArm": "Manual"
+ },
+ "Power": {
+  "@odata.id": "/redfish/v1/Chassis/1/Power"
+ },
+ "SKU": "",
+ "SerialNumber": "",
+ "Status": {
+  "Health": "OK",
+  "HealthRollup": "OK",
+  "State": "Enabled"
+ },
+ "Thermal": {
+  "@odata.id": "/redfish/v1/Chassis/1/Thermal"
+ }
+}