s3-ntlmssp Remove rpccli_get_pwd_hash and auth_ntlmssp_get_nt_hash

s3-ntlmssp Remove rpccli_get_pwd_hash and auth_ntlmssp_get_nt_hash

The session key we want here (the only one that is availble to the
encryption layer) is the one obtained by cli_get_session_key(), as
NTLMSSP creates a per-session session key via key exchange and NTLMv2
negotiation.

The key was never directly the NT hash anyway (this is simply a
mistake, the extra MD4() was lost during my previous cleanup
f28f113d8e76824b080359c90efd9c92de533740 in 2008), but was MD4(NT
hash) in early implementations of NTLMSSP.

However, regardless this call is not available on domain trusts
between AD domains and Windows 2003 R2, making this less useful.

Andrew Bartlett

Signed-off-by: Andrew Tridgell <tridge@samba.org>