[rennes][servers] remove no more used servers

data/grid5000/sites/rennes/servers/cargo0.json

data/grid5000/sites/rennes/servers/cargo1.json

data/grid5000/sites/rennes/servers/cargo2.json

data/grid5000/sites/rennes/servers/cargo3.json

data/grid5000/sites/rennes/servers/ceph-mon0.json

data/grid5000/sites/rennes/servers/ceph-mon1.json

data/grid5000/sites/rennes/servers/ceph-mon2.json

data/grid5000/sites/rennes/servers/demovm.json

data/grid5000/sites/rennes/servers/infra-k8s-master0.json

data/grid5000/sites/rennes/servers/infra-k8s-master1.json

data/grid5000/sites/rennes/servers/k8s-lb0.json

data/grid5000/sites/rennes/servers/k8s-lb1.json

data/grid5000/sites/rennes/servers/k8s-lb2.json

data/grid5000/sites/rennes/servers/k8s-lb3.json

data/grid5000/sites/rennes/servers/k8s-lb4.json

data/grid5000/sites/rennes/servers/k8s-lb5.json

data/grid5000/sites/rennes/servers/parasilo-srv-1.json

data/grid5000/sites/rennes/servers/parasilo-srv-2.json

data/grid5000/sites/rennes/servers/parasilo-srv-3.json

data/grid5000/sites/rennes/servers/rook-storage0.json