[environments] Used available_on method to update environments present on sites.

...rid5000/sites/toulouse/environments/etch-x64-big-2.0.json

...rid5000/sites/toulouse/environments/etch-x64-nfs-2.0.json

...d5000/sites/toulouse/environments/lenny-x64-base-2.0.json

...d5000/sites/toulouse/environments/lenny-x64-base-2.1.json

...d5000/sites/toulouse/environments/lenny-x64-base-2.2.json

...id5000/sites/toulouse/environments/lenny-x64-big-2.0.json

...id5000/sites/toulouse/environments/lenny-x64-big-2.1.json

...id5000/sites/toulouse/environments/lenny-x64-big-2.2.json

...id5000/sites/toulouse/environments/lenny-x64-nfs-2.0.json

...id5000/sites/toulouse/environments/lenny-x64-nfs-2.1.json

...id5000/sites/toulouse/environments/lenny-x64-nfs-2.2.json

generators/input/bordeaux.rb

generators/input/environments.rb

generators/input/grenoble.rb

generators/input/lille.rb

generators/input/lyon.rb

generators/input/nancy.rb

generators/input/orsay-gdx.rb

generators/input/orsay-links.yaml

generators/input/orsay-netgdx.rb