[Samba] Samba 4 slow write

[Jones Syue]

Hello Jeremy,

Sure here is the link to patch:
https://drive.google.com/file/d/0B7hCXnjbSiXFWDltM2lwcVdCdGs/view?usp=sharing

Based on this push:
s3:passdb: do not use the in-memory idmap cache (it will be removed)
https://git.samba.org/?p=samba.git;a=commit;h=c89affbd8da230cae6df25558fe621510690392c

Not quite sure why remove it from git,
perhaps will match new features or something new.
Loop Michael too,
if could help review and comment that will be great help,
thank you.

--
Regards,
Jones Syue | 薛懷宗
QNAP Systems, Inc.