[CRIU] Sync TODO-s for mount.c work

[Oleg Nesterov]

On 04/22, Tycho Andersen wrote:
>
> In this case you have to use --ext-mount-map KEY:VAL as in the good
> old days before --ext-mount-map auto.

I _suspected_ this ;) Thanks.

OK, before I dive into the sources, could you please tell me what
should I pass as KEY:VAL pair? (I didn't read this code yet and I
am not sure if I can understand it, at least quickly).

Oleg.