[luxembourg] Clean kwollect-bullseye VM

data/grid5000/sites/luxembourg/servers/kwollect-bullseye.json

-{
-  "kind": "virtual",
-  "network_adapters": {
-    "default": {
-      "ip": "172.16.191.131"
-    }
-  },
-  "type": "server",
-  "uid": "kwollect-bullseye"
-}
\ No newline at end of file

input/grid5000/sites/luxembourg/servers/virtual.yaml

@@ -161,8 +161,3 @@ guix:
   network_adapters:
     default:
       ip: 172.16.191.130
-kwollect-bullseye:
-  kind: virtual
-  network_adapters:
-    default:
-      ip: 172.16.191.131