smbd: implement SMB_FILE_NORMALIZED_NAME_INFORMATION handling

[Stefan Metzmacher]

Hi,

I just created https://gitlab.com/samba-team/samba/merge_requests/400
with the patches to implement SMB_FILE_NORMALIZED_NAME_INFORMATION.

Windows 10 (1803 and higher) support and use
SMB_FILE_NORMALIZED_NAME_INFORMATION
calls over the network. As a fallback (in case the server don't support
it) the client traverses all path components, which is very expensive.

Implementing SMB_FILE_NORMALIZED_NAME_INFORMATION is very cheap for us
as the open already went through unix_convert() and we have the
information the client is asking for.

See also https://bugzilla.samba.org/show_bug.cgi?id=13919

Please review and push:-)

Thanks!
metze

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