[CRIU] Another attempt at migration processes

[Pavel Emelyanov]

> I was doing that, but probably I did something wrong.
> 
> I will try to clean up my code and will start sending smaller patches to
> the list to prepare the code for migration. Okay?

OK. Also pay attention, that there's still several places in restore which
need an image fd to be lseek-able (pipe, fifo and socket data restoration).
These should be fixed.

> 		Adrian
> .
>