localauth plugin: change return code of sss_an2ln
It is expected that the an2ln plugin function returns KRB5_LNAME_NOTRANS
to indicate that no mapping can be determined and other an2ln methods
can be tried. Currently SSSD's localauth plugin returns
KRB5_PLUGIN_NO_HANDLE which sould only be used for the userok plugin
function.
Resolves https://pagure.io/SSSD/sssd/issue/3459
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Fabiano FidĂȘncio <fidencio@redhat.com>