check_once_cc_get_principal
check_once_cc_get_principal(context, ccache, "foo/BAR@BAZ.ORG", CC_NOERROR, "trying to get krb5 princ for krb5 ccache");
check_once_cc_get_principal(context, ccache, NULL, CC_BAD_PARM, "passed null out param");
cc_result check_once_cc_get_principal(apiCB *context,