We were lying to the client in the case of POSIX_UNLINK

We were lying to the client in the case of POSIX_UNLINK
if a Windows client had the file open. We were setting
delete on close and returning "ok". The POSIX client then
believed the file was gone (and it wasn't). Fix this to
return SHARING_VIOLATION if there is an existing NTcreateX
open on the file and someone calls POSIX_UNLINK. Still one
more Cthon test to fix but getting closer now. Should
be in 3.0.25c also.
Jeremy.

git-svn-id: svn+ssh://svn.samba.org/data/svn/samba/branches/SAMBA_3_2@23935 0c0555d6-39d7-0310-84fc-f1cc0bd64818