api: add function for creating template control groups

api: add function for creating template control groups

    add a function: int cgroup_config_create_template_group(const char *pathname,
                struct cgroup *cgroup, char *template_name,
                int ignore_ownership);

     Physically create a new control group in kernel, based on given control
     group template and configuration file. If given template is not set in
     configuration file, then the procedure works create the control group
     using  cgroup_create_cgroup function

    input parameters are:
    pathname .. name of template configuration file (/etc/cgconfig.conf by default)
    cgroup   .. control group name and subsystems to which it should belong to
    template_name .. name of the template we want to use
    flags .. Bit flags to change the behavior

    return 0 on success

    CHANGELOG:
        reload template rules if it is necessary, don't init them
        create a control group in all controllers which have no relevant template
        return the template name when it is changed - Jan's feedback

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