[rennes] Fixes new network architecture

.../grid5000/sites/rennes/network_equipments/bigdata-sw.json

data/grid5000/sites/rennes/network_equipments/c6509.json

...id5000/sites/rennes/network_equipments/parasilo-sw-1.json

...d5000/sites/rennes/network_equipments/paravance-sw-1.json

...d5000/sites/rennes/network_equipments/paravance-sw-2.json

generators/input/sites/rennes/net-links/bigdata-sw.yaml

generators/input/sites/rennes/net-links/c6509.yaml

generators/input/sites/rennes/net-links/parasilo-sw-1.yaml

generators/input/sites/rennes/net-links/paravance-sw-1.yaml

generators/input/sites/rennes/net-links/paravance-sw-2.yaml