[Samba] Winbind will not start when network disconnected

[Mark F]

I'm preparing some boxes for production and have configured samba with 
winbind for ADS domain authentication but I've noticed that winbind will 
not start when the network is not connected.  I think the proper 
operation should be to start but (of course) not function and log the 
inability to connect to the pdc.

Instead I get this:

PANIC: Could not fetch our SID - did we join?
...
lots of back trace information
...

and the failure to start.

Thanks,
-Mark