unknown_3 flag of USER_INFO

[Jianliang Lu]

> Thanks, very much, I tought it was something like that, but had no time
> to check my idea.
> 
> I'll try to integrate your findings in the weekend if nobody does it
> before.
> 
> Simo.

I hope also that someone give me some feedbacks about my two patchs: one for 
kickoff_time (in MS SAMR is called account_expire) and other for logon time 
that I sent these days.

Ci aggiorniamo più avanti.

Tanti saluti,
Jianliang