python/samba: Adjust tarfile extraction filter

python/samba: Adjust tarfile extraction filter

The 'data_filter' is far too restrictive, this filter doesn't apply any
mode bits to directories which in turn will result in unexpected
directory permissions of the amongst others msg.[ls]ock directories.

With 'data_filter' and a 'patched' python at best we experience
CI failures with samba-ad-back1 & samba-ad-back2 CI jobs due to server
startup failures, at worst user/admins will need to adjust directory
permissions post backup.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15390

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>