s3-auth: use full 16byte session key in make_user_info_netlogon_interactive().

s3-auth: use full 16byte session key in make_user_info_netlogon_interactive().

Patch from Jeremy.

With this patch, I was able to join Windows 7 RC to a Samba3 DC, and login into a
Samba 3 Domain.

There are still two registry settings required:

	HKLM\System\CCS\Services\LanmanWorkstation\Parameters
		DWORD  DomainCompatibilityMode = 1
		DWORD  DNSNameResolutionRequired = 0

Do *not* modify the other netlogon registry parameters that were passed around,
they weaken security.

Guenther / Jeremy.
(cherry picked from commit 0da133101ab149b074ab369d819fc48b7c95bf71)