[Nantes] Add new srv-data2 server

This PR add informations about our new srv-data2 nfs server.

data/grid5000/sites/nantes/servers/srv-data2.json

+{
+  "alias": [
+
+  ],
+  "kind": "physical",
+  "network_adapters": {
+    "bmc": {
+      "ip": "172.17.207.7",
+      "mac": "5c:ed:8c:f7:65:04"
+    },
+    "default": {
+      "ip": "172.16.207.7",
+      "mac": "88:e9:a4:8b:09:52"
+    }
+  },
+  "redfish": true,
+  "serial": "CZ2D1Z09Z8",
+  "type": "server",
+  "uid": "srv-data2",
+  "warranty": "2031-12-10"
+}
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