[environments] add etch 2.0, lenny 1.0 and lenny 2.0 environments

data/grid5000/environments/etch-x64-xen-1.0.json

data/grid5000/environments/lenny-x64-base-1.0.json

data/grid5000/environments/sid-x64-base-1.0.json

data/grid5000/environments/sid-x64-nfs-1.0.json

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

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

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-100.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-101.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-102.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-103.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-104.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-105.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-106.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-107.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-108.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-109.json

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

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-110.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-111.json

...rid5000/sites/nancy/clusters/grelon/nodes/grelon-112.json