smbtorture: New torture test for bug #9870.

smbtorture: New torture test for bug #9870.

Not fetching the latest modification time on a folder if we have read locks on it.

Prove we should just rely on the mtime value from the underlying
filesystem, even with an open handle.

  BUG: https://bugzilla.samba.org/show_bug.cgi?id=9870

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Thu Dec  5 10:05:06 CET 2013 on sn-devel-104

BUG: https://bugzilla.samba.org/show_bug.cgi?id=9870
Not fetching the latest modification time on a folder if we have read locks on
it.

Autobuild-User(v4-1-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-1-test): Tue Dec 10 20:19:08 CET 2013 on sn-devel-104