lxd/db/config.go
func (c *ClusterTx) Config() (map[string]string, error) {
	return query.SelectConfig(c.tx, "config", "")
}
func (c *ClusterTx) Config() (map[string]string, error) {
	return query.SelectConfig(c.tx, "config", "")
}
// Config fetches all LXD cluster config keys.