Add mockup files for the driver tests

UpdateService, the system's EthernetInterfaces and all chassis Sensors from public-rackmount1, unmodified.

tests/fixtures/dmtf-public-rackmount1/Chassis/1U/Sensors/FanBay2/index.json

@@ -0,0 +1,26 @@
+{
+    "@odata.type": "#Sensor.v1_14_0.Sensor",
+    "Id": "FanBay2",
+    "Name": "Chassis Fan #2",
+    "PhysicalContext": "Chassis",
+    "Reading": 45,
+    "SpeedRPM": 2100,
+    "ReadingRangeMax": 100,
+    "ReadingRangeMin": 0,
+    "ReadingType": "Percent",
+    "ReadingUnits": "%",
+    "Status": {
+        "Health": "OK",
+        "State": "Enabled"
+    },
+    "Thresholds": {
+        "LowerCaution": {
+            "Reading": 5
+        },
+        "LowerCritical": {
+            "Reading": 0
+        }
+    },
+    "@odata.id": "/redfish/v1/Chassis/1U/Sensors/FanBay2",
+    "@Redfish.Copyright": "Copyright 2014-2026 DMTF. For the full DMTF copyright policy, see http://www.dmtf.org/about/policies/copyright."
+}