adtrust: avoid using timestamp in klist output
    
    When parsing a keytab to copy keys to a different keytab, we don't need
    the timestamp, so don't ask klist to output it. In some locales (en_IN,
    for example), the timestamp is output in a single field without a space
    between date and time. In other locales it can be represented with date
    and time separated by a space.
    
    Fixes: https://pagure.io/freeipa/issue/8066
    Reviewed-By: Thomas Woerner <twoerner@redhat.com>