Fix most of bug #169.

Fix most of bug #169.

For a (very) long time, we have had a bug in Samba were an NTLMv2-only
PDC would fail, because it converted the password into NTLM format for
checking.

This patch performs the direct comparison required for interactive
logons to function in this situation.  It also removes the 'auth flags', which
simply where not ever used.

Natrually, this plays with the size of structures, so rebuild, rebuild
rebuild...

Andrew Bartlett
(This used to be commit 9598593bcf2d877b1d08cd6a7323ee0bc160d4ba)