LU-4416 ldiskfs: enable support for SLES12

LU-4416 ldiskfs: enable support for SLES12

This patch adds support for the 3.12-based SLE12 kernel. Additonally
this work separates out the basic needed patches for the upstream
3.12 kernel which can be shared with other distros as well as future
upstream kerrnels. This will help with book keeping ldiskfs patches
that need to be pushed upstream.

kernel version SLES12 [3.12.43-52.6]

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Change-Id: I2b8d83cddf8fd27617657348ea6d7c3a48e9472c
Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-on: http://review.whamcloud.com/10165
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>