[environments] Adding lenny-x64-xen-2.4 and squeeze-x64-{big,nfs,xen}-0.9

...rid5000/sites/lille/environments/squeeze-x64-xen-0.9.json

data/grid5000/sites/lyon/environments/lenny-x64-xen-2.4.json

...grid5000/sites/lyon/environments/squeeze-x64-big-0.9.json

...grid5000/sites/lyon/environments/squeeze-x64-nfs-0.9.json

...grid5000/sites/lyon/environments/squeeze-x64-xen-0.9.json

.../grid5000/sites/nancy/environments/lenny-x64-xen-2.4.json

...rid5000/sites/nancy/environments/squeeze-x64-big-0.9.json

...rid5000/sites/nancy/environments/squeeze-x64-nfs-0.9.json

...rid5000/sites/nancy/environments/squeeze-x64-xen-0.9.json

.../grid5000/sites/orsay/environments/lenny-x64-xen-2.4.json

...rid5000/sites/orsay/environments/squeeze-x64-big-0.9.json

...rid5000/sites/orsay/environments/squeeze-x64-nfs-0.9.json

...rid5000/sites/orsay/environments/squeeze-x64-xen-0.9.json

...grid5000/sites/rennes/environments/lenny-x64-xen-2.4.json

...id5000/sites/rennes/environments/squeeze-x64-big-0.9.json

...id5000/sites/rennes/environments/squeeze-x64-nfs-0.9.json

...id5000/sites/rennes/environments/squeeze-x64-xen-0.9.json

...grid5000/sites/sophia/environments/lenny-x64-xen-2.4.json

...id5000/sites/sophia/environments/squeeze-x64-big-0.9.json

...id5000/sites/sophia/environments/squeeze-x64-nfs-0.9.json