[users-vm/nix-datamove] Add nix-datamove vm information

data/grid5000/sites/grenoble/servers/nix-datamove.json

+{
+  "expire": "2024-02",
+  "kind": "virtual",
+  "network_adapters": {
+    "default": {
+      "ip": "172.16.32.2"
+    }
+  },
+  "type": "server",
+  "uid": "nix-datamove"
+}
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