Digxp retirement

data/grid5000/sites/grenoble/servers/digxp.json

-{
-  "alias": null,
-  "kind": "physical",
-  "network_adapters": {
-    "adm": {
-      "ip": "172.17.31.10"
-    },
-    "bmc": {
-      "ip": "172.17.30.10"
-    },
-    "default": {
-      "ip": "172.16.31.10"
-    }
-  },
-  "serial": "n/a",
-  "type": "server",
-  "uid": "digxp",
-  "warranty": "n/a"
-}
\ No newline at end of file