Fix: acl: Do not delay evaluation of added nodes in some situations

It is not appropriate when the node has no children as it is not a
placeholder
crm_element_value_const(const xmlNode * data, const char *name)
{
    return crm_element_value((xmlNode *) data, name);
}

crm_element_value_const(const xmlNode * data, const char *name)
{
    return crm_element_value((xmlNode *) data, name);
}
