[lyon][sagittaire] Retirement procedure for sagittaire-2

data/grid5000/accesses/refrepo.json

...00/sites/lyon/clusters/sagittaire/nodes/sagittaire-2.json

data/grid5000/sites/lyon/network_equipments/salome.json

data/grid5000/sites/lyon/pdus/pdu3a.json

data/grid5000/sites/lyon/pdus/wattmetrev3-1.json

...00/sites/lyon/clusters/sagittaire/nodes/sagittaire-2.yaml

...t/grid5000/sites/lyon/clusters/sagittaire/sagittaire.yaml

input/grid5000/sites/lyon/networks/salome.yaml

input/grid5000/sites/lyon/pdus.yaml