LU-13111 kernel: new kernel [SLES12 SP5 4.12.14-122.20.1]

LU-13111 kernel: new kernel [SLES12 SP5 4.12.14-122.20.1]

This patch makes changes to support new SLES12 SP5 release
for Lustre client.

Test-Parameters: trivial clientdistro=sles12sp5 \
env=SANITY_EXCEPT="56oc 817" testlist=sanity

Change-Id: Ia4b856b03801e02da9a2e584efeb8759b4dd30c3
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/38640
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>