Trac Ticket #311 - IP lookup failing with multiple DNS
        entries
    
    https://fedorahosted.org/389/ticket/311
    
    Bug description: DNS keyword in ACI only accepted an FQDN returned
    from gethostbyaddr.  If an alias hostname was set in an ACI, a request
    sent from the host was treated as the one from the primary hostname
    and it failed to get the expected access rights.
    
    Fix description: This patch turns the "dns" keyword covers the alias
    hostnames, as well.  In addition to the primary hostname, by setting
    the secondary hostnames as dns, clients requests would obtain the
    expected access rights.  When an IP address is associated with multiple
    hostnames (primary: hostA, aliases: hostB and hostC), they could be
    listed, for instance, in an aci as follows:
    aci: (targetattr = "*") (version 3.0;acl "dns example";allow (all)
      dns="hostA.example.com" or dns="hostB.example.com" or dns="hostC.
      example.com";)