Revert "[nancy] add grcinq cluster"

data/grid5000/sites/nancy/clusters/grcinq/grcinq.json

.../grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-1.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-10.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-11.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-12.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-13.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-14.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-15.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-16.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-17.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-18.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-19.json

.../grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-2.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-20.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-21.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-22.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-23.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-24.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-25.json

...grid5000/sites/nancy/clusters/grcinq/nodes/grcinq-26.json