it_nv_to_config
ret = it_nv_to_config(cfg_nv, &newcfg);
if (it_nv_to_config(nvl, &cfg) != 0) {
rc = it_nv_to_config(cfg_nvlist, &cfg);
it_nv_to_config(nvlist_t *nvl, it_config_t **cfg);