[rennes][abacusX][roazhonX] minimal config for mass SSH keys creation

input/grid5000/ipv4.yaml

input/grid5000/sites/rennes/clusters/abacus1/abacus1.yaml

input/grid5000/sites/rennes/clusters/abacus10/abacus10.yaml

input/grid5000/sites/rennes/clusters/abacus11/abacus11.yaml

input/grid5000/sites/rennes/clusters/abacus12/abacus12.yaml

input/grid5000/sites/rennes/clusters/abacus13/abacus13.yaml

input/grid5000/sites/rennes/clusters/abacus14/abacus14.yaml

input/grid5000/sites/rennes/clusters/abacus15/abacus15.yaml

input/grid5000/sites/rennes/clusters/abacus16/abacus16.yaml

input/grid5000/sites/rennes/clusters/abacus17/abacus17.yaml

input/grid5000/sites/rennes/clusters/abacus18/abacus18.yaml

input/grid5000/sites/rennes/clusters/abacus19/abacus19.yaml

input/grid5000/sites/rennes/clusters/abacus2/abacus2.yaml

input/grid5000/sites/rennes/clusters/abacus20/abacus20.yaml

input/grid5000/sites/rennes/clusters/abacus21/abacus21.yaml

input/grid5000/sites/rennes/clusters/abacus22/abacus22.yaml

input/grid5000/sites/rennes/clusters/abacus25/abacus25.yaml

input/grid5000/sites/rennes/clusters/abacus3/abacus3.yaml

input/grid5000/sites/rennes/clusters/abacus4/abacus4.yaml

input/grid5000/sites/rennes/clusters/abacus5/abacus5.yaml