smbd: Test cleanup of disconnected durable handle records

smbd: Test cleanup of disconnected durable handle records

Right now this panics the scavenger daemon, preventing it from doing
its work. The reopen we expect to fail with
NT_STATUS_OBJECT_NAME_NOT_FOUND thus succeeds. I know that we should
more precisely detect the scavenger crash and with Jeremy's pattern in
46899ecf836 this would be possible. However, this is C code right now,
and scanning the logfile for the panic is more I have time for right
now. The test successfully indicates failure, as the next commit will
show.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>