ipatests: Fix expectation about GSS error in test for healthcheck
As of 1.19.1 MIT krb changed the error returned if no valid
credentials could be obtained(GSS_S_CRED_UNAVAIL->GSS_S_NO_CRED).
To be compatible with previous versions of krb the new expected
error message has been added.
Fixes: https://pagure.io/freeipa/issue/8737
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>