s4:smbtorture do not leave output directory around

s4:smbtorture do not leave output directory around

calling smbtorture with no or invalid arguments left the temporary
output directory around
this patches removes the dead-end exit from usage and makes the
logic go on until the final cleanup state is reached

output directory will still be left around when test times out
or testcases itself force an exit

also make sure that the directory itself is deleted, not just
the objects in it

Signed-off-by: Matthias Dieter Wallnöfer <mdw@samba.org>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User: Matthias Dieter Wallnöfer <mdw@samba.org>
Autobuild-Date: Mon Feb 21 11:35:30 CET 2011 on sn-devel-104