cluster 'date_of_arrival' is changed to 'created_at', which is an HTTP date

README

data/grid5000/services/authorization.json

data/grid5000/services/jobsets.json

data/grid5000/services/oar.json

data/grid5000/services/statuses.json

data/grid5000/sites/grenoble/clusters/genepi/genepi.json

data/grid5000/sites/lille/clusters/chicon/chicon.json

.../grid5000/sites/lille/clusters/chinqchint/chinqchint.json

data/grid5000/sites/lille/clusters/chti/chti.json

data/grid5000/sites/lille/clusters/chuque/chuque.json

data/grid5000/sites/lyon/clusters/capricorne/capricorne.json

data/grid5000/sites/lyon/clusters/sagittaire/sagittaire.json

data/grid5000/sites/nancy/clusters/grelon/grelon.json

data/grid5000/sites/nancy/clusters/grillon/grillon.json

data/grid5000/sites/orsay/clusters/gdx/gdx.json

data/grid5000/sites/orsay/clusters/netgdx/netgdx.json

data/grid5000/sites/rennes/clusters/paramount/paramount.json

data/grid5000/sites/rennes/clusters/paraquad/paraquad.json

data/grid5000/sites/sophia/clusters/azur/azur.json

data/grid5000/sites/sophia/clusters/helios/helios.json