def up(force=True, env=None, **kwargs):
    "Starts a new experiment"
    inventory = os.path.join(os.getcwd(), "hosts")
    conf = Configuration.from_dictionnary(provider_conf)
    provider = Enos_vagrant(conf)
    roles, networks = provider.init()
    check_networks(roles, networks)
    env["roles"] = roles
    env["networks"] = networks
Starts a new experiment