SYSKEY, TNG freeze, 2.0.x->TNG merge and other thoughts

[Luke Kenneth Casson Leighton]

srv_netlogon.c.  aside from being totally rewritten, extended etc in tng,
2_0 netlogon is one-process-specific.  if the 2_0 netlogon services
terminate, the connection cannot be re-established without the client
having to redo the credential chain.

2_0 netlogon code only does NTLMv1.  it also doesn't do "network"
pass-through to trusted domain controllers.  it doesn't generate a "user
session key".  it doesn't have the "general" logon type - type 0x4.

it also assumes that all strings are ascii not Unicode in the user's
profile, and it doesn't support other samr daemons that _do_ support
Unicode.

matthew chapman also added proper functionality for the following:

net_trust_dom_list

net_logon_control

net_sam_sync.

so srv_netlogon.c needs to be totally replaced with srv_netlogon_nt.c and
srv_netlogon.c from TNG.

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