Feature Request: Dynamic change endpoints

[halfcrazy]

If ovsdb cluster scales up, there is no way to update endpoints without downtime. Eg ovn-nb as a daemonset on master nodes.

https://github.com/ovn-org/libovsdb/blob/main/client/client.go#L249-L259

	for i, endpoint := range o.endpoints {
		u, err := url.Parse(endpoint.address)
		if err != nil {
			return err
		}
		if sid, err := o.tryEndpoint(ctx, u); err != nil {
			o.resetRPCClient()
			connectErrors = append(connectErrors,
				fmt.Errorf("failed to connect to %s: %w", endpoint.address, err))
			continue
		} else {

https://github.com/ovn-org/libovsdb/blob/main/client/client.go#L523-L532

// SetOption sets a new value for an option.
// It may only be called when the client is not connected
func (o *ovsdbClient) SetOption(opt Option) error {
	o.rpcMutex.RLock()
	defer o.rpcMutex.RUnlock()
	if o.rpcClient != nil {
		return fmt.Errorf("cannot set option when client is connected")
	}
	return opt(o.options)
}