check_once_cc_open
err = check_once_cc_open(context, name, CC_CRED_V5, &ccache, CC_NOERROR, NULL);
err = check_once_cc_open(context, NULL, CC_CRED_V5, &ccache, CC_BAD_PARM, NULL);
err = check_once_cc_open(context, name, CC_CRED_V5, NULL, CC_BAD_PARM, NULL);
err = check_once_cc_open(context, name, CC_CRED_UNKNOWN, &ccache, CC_ERR_CRED_VERSION, NULL);
cc_result check_once_cc_open(apiCB *context, const char *name, cc_int32 version, ccache_p **ccache, cc_result expected_err, const char *description);