LU-16755 kernel: RHEL 8.8 client and server support

LU-16755 kernel: RHEL 8.8 client and server support

This patch makes changes to support RHEL 8.8 release
with kernel 4.18.0-477.el8 for Lustre client and server.

Lustre-change: https://review.whamcloud.com/50708
Lustre-commit: TBD (from 401fbba442e365a7c79f5526f44ebac7e6a2fc07)

Test-Parameters: trivial fstype=ldiskfs \
clientdistro=el8.8 serverdistro=el8.8 testlist=sanity

Test-Parameters: trivial fstype=zfs \
clientdistro=el8.8 serverdistro=el8.8 testlist=sanity

Change-Id: Ie47f131e0340a601c8a5d748ecf9b1b73d4baa1f
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50729
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>