restrict anonymous patch against 2beta2

[Luke Kenneth Casson Leighton]

> It has one side effect (related to how NT behaves after logout):
>  - If you are using samba as a PDC, the client machine will be unable 
>    to revalidate it's machine account after a user logs out because 
>    WinNT maintains a validated connection after logout, and it tries to 

can you investigate this further by attempting to detect when an NT
workstation user is logging out, and terminating the smbd process at the
server-side?

i tried this at one point, by detecting SMBulogoffs and SMBtdis or
something, but didn't get very far.

how about, say, if the first connection to a smbd process was an IPC$ and
then subsequent connections were to [homes] or other, then if the
connection to everything but IPC$ is closed [SMBtdis] then you drop the
connection (exit(1))?

or other such evil behaviour...