Trac Ticket #46 - setup-ds-admin.pl does not like ipv6 only hostnames
    
    https://fedorahosted.org/389/ticket/46
    
    Fix Description:
    Perl functions gethostbyname/gethostbyaddr do not support IPv6
    addresses.  This patch replaces the obsolete functions with the
    ones from Socket::GetAddrInfo.