python: call fault_setup() if samba.getopt is used

python: call fault_setup() if samba.getopt is used

This means we have a samba command line tool written in python,
e.g. samba-tool

We should get the samba typicall backtraces instead of
just "Segmentation fault (core dumped)".

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13469

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Tue Jun 12 11:04:55 CEST 2018 on sn-devel-144