[orsay] updating switches ip and mac addresses.

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-253.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-254.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-255.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-256.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-257.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-258.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-259.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-260.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-261.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-262.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-263.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-264.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-265.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-266.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-267.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-268.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-269.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-270.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-271.json

data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-272.json