torture: include config.h before any glibc headers

torture: include config.h before any glibc headers

config.h may have some flags which affect glibc behavior, e.g.
_FILE_OFFSET_BITS=64. To make sure these flags have the desired
effect, config.h must be included before any glibc header files.

Also remove inclusion of some system files, relying on
replace/system/*.h instead.

This commit does not fix a specific known bug. It changes the code to
comply with coding conventions.

Signed-off-by: Uri Simchoni <urisimchoni@gmail.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: "Stefan Metzmacher" <metze@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Jul 17 04:41:14 CEST 2015 on sn-devel-104