lib: Make fd_load work for non-regular files

lib: Make fd_load work for non-regular files

Follow-up to

https://lists.samba.org/archive/samba/2018-September/217992.html

and following. This also fixes a small and very theoretical race: Between the
fstat and the read call the file size might change. This would make us fail on
potentially legitimate files.

This is more complex and probably slower, but looking at the use cases I don't
think the speed matters.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13859

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Tue Mar 26 04:43:40 UTC 2019 on sn-devel-144