LU-9223: Server on Linux 4.4: XATTR_NAME_POSIX_ACL_ACCESS

LU-9223: Server on Linux 4.4: XATTR_NAME_POSIX_ACL_ACCESS

Add linux/xattr.h to Lustre_compat.h to allow the server
code to Build in Linux 4.4.

Change-Id: Iccf87acffc04d7c1084a384ae146d1077eed53fd
Signed-off-by: Keith <keith.mannthey@intel.com>
Reviewed-on: https://review.whamcloud.com/26076
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>