[PATCH] Test the netlogon challenge cache better and add helpful logs

[Stefan Metzmacher]

Hi Andrew,

> Debugging incorrect machine accounts on netlogon is really painful, as
> there are essentially no useful logs on the AD DC for wrong machine
> account passwords.  
> 
> This fixes it.  In the long run a proper hook into the audit logs are
> due, but this is a good start. 

Can you please add a bug for the proper solution, I think it's needed
before 4.7.0 final.

> I started this due to a suggestion that our challenge cache wasn't
> right and so I added tests to demonstrate better the capabilities and
> limitations. 
> 
> Please review and push,

Reviewed by me.

metze


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