LU-18156 kernel: update SLES15 SP5 [5.14.21-150500.55.73.1]

LU-18156 kernel: update SLES15 SP5 [5.14.21-150500.55.73.1]

Update SLES15 SP5 kernel to 5.14.21-150500.55.73.1 for Lustre client.

Test-Parameters: trivial mdtcount=4 mdscount=2 \
  clientdistro=sles15sp5 testlist=sanity

Test-Parameters: optional clientdistro=sles15sp5 testgroup=full-part-1
Test-Parameters: optional clientdistro=sles15sp5 testgroup=full-part-2
Test-Parameters: optional clientdistro=sles15sp5 testgroup=full-part-3

Change-Id: I885498d28685e6f0c40e8b9a94f55473cb599924
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56092
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Alex Deiter
Reviewed-by: Oleg Drokin <green@whamcloud.com>