s4:libcli/raw: make short_name available in buffer

This will be used in smb2/create AAPL context torture tests, where the
server returns an Mac OS X specific data blob in the short name
buffer. It's not a string, so the existing string extraction doesn't
cut it.

Signed-off-by: Ralph Boehme <rb@sernet.de>
s4:torture:vfs_fruit: smb2/create context AAPL test

Signed-off-by: Ralph Boehme <rb@sernet.de>
s3: smbd: POSIX ACLs: support for MS NFS style uid, gid and mode

Add optional support for MS NFS style mapping. uid, gid and mode can
be queried with get_secinfo, mode can be changed with
set_secinfo. This is only enabled by smb2/create context AAPL
capability negotiation atm.

Signed-off-by: Ralph Boehme <rb@sernet.de>