r15426: Implement SPNEGO as the default RPC authentication mechanism. Where
this isn't supported, fallback to NTLM.
Also, where we get a failure as 'logon failure', try and do a '3
tries' for the password, like we already do for CIFS. (Incomplete:
needs a mapping between RPC errors and the logon failure NTSTATUS).
Because we don't yet support Kerberos sign/seal to win2k3 SP1 for
DCE/RPC, disable this (causing SPNEGO to negotiate NTLM) when kerberos
isn't demanded.
Andrew Bartlett
(This used to be commit
b3212d1fb91b26c1d326a289560106dffe1d2e80)