nvf_data_clear
boolean_t nvf_data_clear(char *id, char *name);
rval = nvf_data_clear(CHAP_PARAMS_ID, node);
rval = nvf_data_clear(BIDIR_AUTH_PARAMS_ID, node);
rval = nvf_data_clear(STATIC_ADDR2_ID, key);
rval = nvf_data_clear(ISNS_SERVER_ADDR_ID, name);
rval = nvf_data_clear(DISCOVERY_ADDR_ID, name);
rval1 = nvf_data_clear(LOGIN_PARAMS_ID, node);
rval2 = nvf_data_clear(SESSION_PARAMS_ID, node);
rval3 = nvf_data_clear(TUNABLE_PARAMS_ID, node);