Ticket 50138 - db2bak.pl -P LDAPS does not work when nsslapd-securePort is missing
    
    Bug Description:
    When nsslapd-securePort is not set in dse.ldif, DSUtil (in case of LDAPS)
    interpolates ldapmodify (and other) call to a URI ending only with a colon
    because obtained securePort is just an empty string. The very same turns out to
    happen for the nsslapd-port.
    
    Fix Description:
    Hardcode the default ports, which is a short variant of omitting the
    colon and port, and which would be chosen by the OpenLDAP utils any way.
    
    https://pagure.io/389-ds-base/issue/50138
    
    Author: mhonek
    
    Review by: mreynolds (thanks!)