r1141: - consolidated the netr_SamInfo structures using a netr_SamBaseInfo

r1141: - consolidated the netr_SamInfo structures using a netr_SamBaseInfo
  structure (andrew, this is the type of structure consolidation I think
  you were asking about. It's possible here in NDR as it isn't in the
  top level fn code)

- added validation level 6 in sam logon

With these changes I can successfully authentication smbclient to a
winxp server, with the winxp server using a Samba4 ADS DC for account
auth
(This used to be commit 705205083a6e2430c420f44436a1d1ff8826bc73)