Merge branch 'grenoble_network' into 'master'

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

...sites/grenoble/network_equipments/imag-1b-F1-prod-01.json

...sites/grenoble/network_equipments/imag-1b-F2-prod-01.json

...sites/grenoble/network_equipments/imag-1b-F3-prod-01.json

data/grid5000/sites/grenoble/servers/srv-data.json

data/grid5000/sites/grenoble/servers/srv-data2.json

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

.../grid5000/sites/grenoble/networks/imag-1b-F1-prod-01.yaml

.../grid5000/sites/grenoble/networks/imag-1b-F2-prod-01.yaml

.../grid5000/sites/grenoble/networks/imag-1b-F3-prod-01.yaml

input/grid5000/sites/grenoble/servers/physical.yaml