[Nantes] add cooling system metrics

data/grid5000/sites/nantes/pdus/cooling-Z1.json

+{
+  "ip": "192.168.1.17",
+  "mac": "00:c0:b7:f5:fa:63",
+  "metrics": [
+    {
+      "description": "Temperature in input of cooling system, in tenths of degrees Celsius",
+      "name": "cooling_input_temperature_tenth_celsius",
+      "period": 5000,
+      "source": {
+        "id": "1.3.6.1.4.1.318.1.1.27.1.4.1.2.1.3.1.7",
+        "protocol": "snmp"
+      }
+    },
+    {
+      "description": "Temperature in output of cooling system, in tenths of degrees Celsius",
+      "name": "cooling_output_temperature_tenth_celsius",
+      "period": 5000,
+      "source": {
+        "id": "1.3.6.1.4.1.318.1.1.27.1.4.1.2.1.3.1.9",
+        "protocol": "snmp"
+      }
+    },
+    {
+      "description": "Power consumption of cooling system, in tenths of kilowatt",
+      "name": "cooling_power_watt",
+      "period": 5000,
+      "source": {
+        "id": "1.3.6.1.4.1.318.1.1.27.1.6.1.2.1.3.1.2",
+        "protocol": "snmp"
+      }
+    },
+    {
+      "description": "Sensor temperature reading, in tenths of degrees Celsius",
+      "name": "pdu_temperature_tenth_celsius",
+      "period": 5000,
+      "source": {
+        "id": "1.3.6.1.4.1.318.1.1.27.1.4.1.2.1.3.1.%PORT%",
+        "protocol": "snmp"
+      }
+    }
+  ],
+  "model": "ACRD602",
+  "ports": {
+    "31": "pdu-Z1.20",
+    "33": "pdu-Z1.40",
+    "35": "pdu-Z1.50"
+  },
+  "type": "pdu",
+  "uid": "cooling-Z1",
+  "vendor": "APC"
+}
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