check_once_cc_store
check_once_cc_store(context, ccache, creds_union, CC_NOERROR, "ok creds");
check_once_cc_store(context, ccache, creds_union, CC_BAD_PARM, "invalid creds (NULL client string)");
check_once_cc_store(context, ccache, creds_union, CC_NO_EXIST, "invalid ccache");
cc_result check_once_cc_store(apiCB *context, ccache_p *ccache, const cred_union in_creds, cc_int32 expected_err, const char *description);