Add possibility to pass url parameter to update command of details page
    
    'update_attribute' can contain a name of field in details page. In that case the value
    of the field with field name will be appended to the update command options.
    
    Part of: https://fedorahosted.org/freeipa/ticket/5426
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>