[luxembourg/server] remove api-server-v4

data/grid5000/sites/luxembourg/servers/api-server-v4.json

-{
-  "kind": "virtual",
-  "network_adapters": {
-    "default": {
-      "ip": "172.16.191.128"
-    }
-  },
-  "type": "server",
-  "uid": "api-server-v4"
-}
\ No newline at end of file

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

@@ -87,9 +87,6 @@ weathermap:
 www:
   kind: virtual
   network_adapters: {default: {ip: 172.16.191.108}}
-api-server-v4:
-  kind: virtual
-  network_adapters: {default: {ip: 172.16.191.128}}
 kwollect:
   kind: virtual
   network_adapters: {default: {ip: 172.16.191.129}}