DNS Locations: add idnsTemplateObject objectclass
    
    The objectclass and its related is used for generating cname records
    inside bind-dyndb-ldap, see design for more details
    https://fedorahosted.org/bind-dyndb-ldap/wiki/Design/RecordGenerator
    
    https://fedorahosted.org/freeipa/ticket/2008
    
    Reviewed-By: Petr Spacek <pspacek@redhat.com>
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>