[sophia][network] update description and network topology after gw migration

...00/sites/sophia/clusters/esterel41/nodes/esterel41-1.json

data/grid5000/sites/sophia/clusters/musa/nodes/musa-1.json

data/grid5000/sites/sophia/clusters/musa/nodes/musa-2.json

data/grid5000/sites/sophia/clusters/musa/nodes/musa-3.json

data/grid5000/sites/sophia/clusters/musa/nodes/musa-4.json

data/grid5000/sites/sophia/clusters/musa/nodes/musa-5.json

data/grid5000/sites/sophia/clusters/musa/nodes/musa-6.json

data/grid5000/sites/sophia/network_equipments/gw.json

data/grid5000/sites/sophia/network_equipments/sw-1.json

data/grid5000/sites/sophia/network_equipments/sw-2.json

data/grid5000/sites/sophia/network_equipments/sw-3.json

input/grid5000/sites/sophia/networks/gw-sophia.yaml

input/grid5000/sites/sophia/networks/sw-1.yaml

input/grid5000/sites/sophia/networks/sw-2.yaml

input/grid5000/sites/sophia/networks/sw-3.yaml