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/Systems/1/Processors/2/index.json

@@ -0,0 +1,28 @@
+{
+ "@odata.context": "/redfish/v1/$metadata#Processor.Processor",
+ "@odata.id": "/redfish/v1/Systems/1/Processors/2",
+ "@odata.type": "#Processor.v1_0_0.Processor",
+ "Description": "Processor",
+ "Id": "2",
+ "InstructionSet": "x86-64",
+ "Manufacturer": "Intel",
+ "MaxSpeedMHz": 4000,
+ "Model": "Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz",
+ "Name": "Processor2",
+ "ProcessorArchitecture": "x86",
+ "ProcessorId": {
+  "EffectiveFamily": "0x6",
+  "EffectiveModel": "0x3F",
+  "IdentificationRegisters": "0xBFEBFBFF000306F2",
+  "Step": "0x2",
+  "VendorId": "GenuineIntel"
+ },
+ "ProcessorType": "CPU",
+ "Socket": "CPU2",
+ "Status": {
+  "Health": "OK",
+  "State": "Enabled"
+ },
+ "TotalCores": 6,
+ "TotalThreads": 12
+}