s4: torture: Add regression test case for #10671 - Samba file corruption as a result...

s4: torture: Add regression test case for #10671 - Samba file corruption as a result of failed lock check.

Adds a new test to raw.open.

Opens a file with SHARE_NONE, writes 1 byte at offset 1023,
attempts a second open with r/w access+truncate disposition,
then checks that open fails with SHARING_VIOLATION, and
the file is not truncated (is still size 1024). Correctly
detects the bug and fixed smbd for me.

https://bugzilla.samba.org/show_bug.cgi?id=10671

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