LU-14527 kernel: kernel update RHEL7.9 [3.10.0-1160.21.1.el7]

LU-14527 kernel: kernel update RHEL7.9 [3.10.0-1160.21.1.el7]

Update RHEL7.9 kernel to 3.10.0-1160.21.1.el7.

Test-Parameters: clientdistro=el7.9 serverdistro=el7.9

Change-Id: I1a46fe492d280b19c0f93458aaac975a4c873caf
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/42090
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: Li Xi <lixi@ddn.com>