[Samba] Remove Win2008R2 from Domain, remove missing DC from domain

[Lukas Gradl]

Hi!

I'm almost done with a migration from Win2k to Samba4. To get this  
going I had to install a Win2008R2 Server as an intermediate server,  
now I want to get rid of it.

I found a bug that Win2008R2 can not be demoted from Samba Domain - so  
I think I've to remove it somehow else.
But I couldn't find anything about that in the docs and on google.

So anyone out there with a little help on that topic?

regars
Lukas