s3: smbd: Fix delete operations enumerating streams inside a file. This must always...

s3: smbd: Fix delete operations enumerating streams inside a file. This must always be done as a Windows operation.

When using UNIX extensions to delete a file containing streams,
the open for delete and close operations need to enumerate the
contained streams and do CREATE and UNLINK operations on the
stream names. These must always be done as Windows operations
(use lp_set_posix_pathnames(false) to flip the processing) as
the stream names are Windows paths.

Without this the create operation under the unlink will
recurse and cause the client to time out (or a server crash).

This (hack) is only needed for 4.4.x and below, it is fixed
correctly in 4.5.x.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12021

Signed-off-by: Jeremy Allison <jra@samba.org>
Autobuild-User(v4-4-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-4-test): Tue Aug  2 16:25:32 CEST 2016 on sn-devel-144