DNS Locations: optimization: use server-find to get information
    
    Because separated calls for of server-show, getting server data is quite
    slow. This commit replaces several server-show with one server-find
    command. There are future plans to improve speed of server-find that
    will be beneficial for DNS locations.
    
    https://fedorahosted.org/freeipa/ticket/2008
    
    Reviewed-By: Petr Spacek <pspacek@redhat.com>