[grenoble] Remove (temporarily) the virtual feature for edel.

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-64.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-65.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-66.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-67.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-68.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-69.json

data/grid5000/sites/grenoble/clusters/edel/nodes/edel-7.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-70.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-71.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-72.json

data/grid5000/sites/grenoble/clusters/edel/nodes/edel-8.json

data/grid5000/sites/grenoble/clusters/edel/nodes/edel-9.json

generators/input/grenoble.rb