Added environments supported at Nancy.

.../grid5000/sites/nancy/environments/etch-x64-base-1.0.json

.../grid5000/sites/nancy/environments/etch-x64-base-1.1.json

data/grid5000/sites/nancy/environments/etch-x64-big-1.0.json

data/grid5000/sites/nancy/environments/etch-x64-big-1.1.json

data/grid5000/sites/nancy/environments/etch-x64-nfs-1.0.json

data/grid5000/sites/nancy/environments/etch-x64-nfs-1.1.json

...grid5000/sites/nancy/environments/lenny-x64-base-0.9.json

.../grid5000/sites/nancy/environments/lenny-x64-big-0.9.json

.../grid5000/sites/nancy/environments/lenny-x64-nfs-0.9.json

data/grid5000/sites/nancy/environments/sid-x64-base-1.1.json

data/grid5000/sites/nancy/environments/sid-x64-big-1.1.json

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

data/grid5000/sites/nancy/environments/sid-x64-nfs-1.1.json