LU-17275 kernel: RHEL 8.9 client and server support

LU-17275 kernel: RHEL 8.9 client and server support

This patch makes changes to support RHEL 8.9 release
with kernel 4.18.0-513.5.1.el8_9 for Lustre client and server.

Test-Parameters: trivial fstype=ldiskfs mdtcount=4 mdscount=2 \
clientdistro=el8.9 serverdistro=el8.8 testlist=sanity

Test-Parameters: trivial fstype=zfs mdtcount=4 mdscount=2 \
clientdistro=el8.9 serverdistro=el8.8 testlist=sanity

Test-Parameters: trivial fstype=ldiskfs mdtcount=4 mdscount=2 \
clientdistro=el8.8 serverdistro=el8.9 testlist=sanity

Test-Parameters: trivial fstype=zfs mdtcount=4 mdscount=2 \
clientdistro=el8.8 serverdistro=el8.9 testlist=sanity

Test-Parameters: optional clientdistro=el8.9 serverdistro=el8.9 \
testgroup=full-part-1

Test-Parameters: optional clientdistro=el8.9 serverdistro=el8.9 \
testgroup=full-part-2

Test-Parameters: optional clientdistro=el8.9 serverdistro=el8.9 \
testgroup=full-part-3

Change-Id: Ia3672d134534b877bb6aaffb4cea0339bc55974f
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53071
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>