WebUI tests: add test for krbtpolicy passkey maxlife/maxrenew
    
    Add a new test ensuring that it is possible to modify
    the krbt policy settings related to passkey authentication
    (max life and max renew)
    
    Related: https://pagure.io/freeipa/issue/9262
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>