lxd/db/containers.go
func (c *Cluster) ContainerConfigRemove(id int, key string) error {
	err := exec(c.db, "DELETE FROM containers_config WHERE key=? AND container_id=?", key, id)
	return err
}
func (c *Cluster) ContainerConfigRemove(id int, key string) error {
	err := exec(c.db, "DELETE FROM containers_config WHERE key=? AND container_id=?", key, id)
	return err
}
// ContainerConfigRemove removes the given key from the config of the container
// with the given ID.