RFC: Removing the --use-cached-creds parameter from ntlm_auth

[Kai Blin]

Hi Rob,

I've done some digging about using cached credentials from winbindd, and this 
currently breaks with how we use this from Wine. Specifically, it's not 
possible to get the session key from winbindd. This breaks our later attempts 
to do signing/sealing. It might be possible to change winbindd to include 
this information, but in order to not leak user password information, 
winbindd can only do so for NTLMv2 and NTLM2.

In any case, --use-cached-creds will make things break in new and interesting 
ways for users who actually are running winbindd. I propose to stop setting 
that parameter until we figure out how to make this work.

Cheers,
Kai