cgconfigparser: add template tag to cgconfigparser

cgconfigparser: add template tag to cgconfigparser

    Template cgroups mean control groups which are set in cgrules.conf file and the name contains % variable like %U (see cgrules.conf manual page for the whole list of variables).

    This patch tunes cgconfigparser to accept template tag. With this patch the tag is accepted and ignored. The next patch will parse it and do relevant work.

    Example:
        template student/%u {
            cpu {
                    cpu.shares = "1000";
            }
        }

    Signed-off-by: Ivana Hutarova Varekova <varekova@redhat.com>
    Acked-By: Jan Safranek <jsafrane@redhat.com>