samba-tool ntacl: allow to run get/set-ntacl command in non-AD-DC role

[Björn Baumbach]

Hi!

The attached patch set allows to use the samba-tool ntacl get/set
commands on a Samba member server. This can be used locally, runs much
faster than smbcacls and does not need a smb connection.

But since there is no smb connection, there is no real session. There is
some code in the vfs modules which segfaults if there is no session info
available. Therefore I've added some functionality to pass a system
session in the pysmbd code.

Volker has already reviewed the code. But I like to introduce the
changes here. Comments are welcome :-)

Best regards,
Björn

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