Description of problem:


In RHOS-16.2 RHEL-8 integration line, ovb jobs are failing due to following reasons at this step
https://opendev.org/openstack/tripleo-quickstart-extras/src/branch/master/playbooks/baremetal-full-overcloud-validate.yml#L19:
``` 
PLAY [setup dstat performance monitoring] **************************************

2022-07-20 23:43:03.536565 | primary |
TASK [Gathering Facts] *********************************************************

2022-07-20 23:43:03.536625 | primary | Wednesday 20 July 2022  23:43:03 -0400 (0:00:00.288)       2:00:10.708 ********

2022-07-20 23:43:08.557699 | primary | fatal: [overcloud-controller-1]: UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host via ssh: Warning: Permanently added '127.0.0.2' (ECDSA) to the list of known hosts.\r\nWarning: Permanently added 'overcloud-controller-1' (ECDSA) to the list of known hosts.\r\ntripleo-admin@overcloud-controller-1: Permission denied (publickey).", "unreachable": true}

2022-07-20 23:43:08.615266 | primary | fatal: [overcloud-controller-0]: UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host via ssh: Warning: Permanently added '127.0.0.2' (ECDSA) to the list of known hosts.\r\nWarning: Permanently added 'overcloud-controller-0' (ECDSA) to the list of known hosts.\r\ntripleo-admin@overcloud-controller-0: Permission denied (publickey).", "unreachable": true}

2022-07-20 23:43:08.648094 | primary | fatal: [overcloud-controller-2]: UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host via ssh: Warning: Permanently added '127.0.0.2' (ECDSA) to the list of known hosts.\r\nWarning: Permanently added 'overcloud-controller-2' (ECDSA) to the list of known hosts.\r\ntripleo-admin@overcloud-controller-2: Permission denied (publickey).", "unreachable": true}

2022-07-20 23:43:08.743256 | primary | fatal: [overcloud-novacompute-0]: UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host via ssh: Warning: Permanently added '127.0.0.2' (ECDSA) to the list of known hosts.\r\nWarning: Permanently added 'overcloud-novacompute-0' (ECDSA) to the list of known hosts.\r\ntripleo-admin@overcloud-novacompute-0: Permission denied (publickey).", "unreachable": true}

2022-07-20 23:43:18.778759 | primary | ok: [127.0.0.2]
```
and it changes the exit status of the playbook leading to job failure
```
PLAY RECAP *********************************************************************

2022-07-21 00:29:10.571089 | primary | 127.0.0.2                  : ok=4    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0

2022-07-21 00:29:10.571096 | primary | localhost                  : ok=18   changed=7    unreachable=0    failed=0    skipped=78   rescued=0    ignored=0

2022-07-21 00:29:10.571104 | primary | overcloud-controller-0     : ok=0    changed=0    unreachable=1    failed=0    skipped=0    rescued=0    ignored=0

2022-07-21 00:29:10.571139 | primary | overcloud-controller-1     : ok=0    changed=0    unreachable=1    failed=0    skipped=0    rescued=0    ignored=0

2022-07-21 00:29:10.571149 | primary | overcloud-controller-2     : ok=0    changed=0    unreachable=1    failed=0    skipped=0    rescued=0    ignored=0

2022-07-21 00:29:10.572968 | primary | overcloud-novacompute-0    : ok=0    changed=0    unreachable=1    failed=0    skipped=0    rescued=0    ignored=0

2022-07-21 00:29:10.573014 | primary | undercloud                 : ok=300  changed=124  unreachable=0    failed=0    skipped=486  rescued=0    ignored=5

2022-07-21 00:29:10.573020 | primary |

2022-07-21 00:29:10.573033 | primary | Thursday 21 July 2022  00:29:10 -0400 (0:00:00.196)       2:46:17.743 *********

2022-07-21 00:29:10.573037 | primary | ===============================================================================

2022-07-21 00:29:10.663855 | primary | overcloud-deploy : Deploy the overcloud ------------------------------ 3189.09s

2022-07-21 00:29:10.663897 | primary | os_tempest : Execute tempest tests ----------------------------------- 2597.61s

2022-07-21 00:29:10.663902 | primary | tripleo.operator.tripleo_undercloud_install : undercloud install ----- 2090.16s

2022-07-21 00:29:10.663905 | primary | repo-setup : Setup repos on live host --------------------------------- 406.53s

2022-07-21 00:29:10.663909 | primary | tripleo.operator.tripleo_overcloud_node_introspect : Introspect node -- 367.31s

2022-07-21 00:29:10.665006 | primary | undercloud-setup : Run the package installation script ---------------- 304.53s

2022-07-21 00:29:10.665023 | primary | validate-perf : Install the latest version of dstat on overcloud ------- 68.79s

2022-07-21 00:29:10.665028 | primary | modify-image : Close initramfs image ----------------------------------- 50.87s

2022-07-21 00:29:10.665032 | primary | tripleo.operator.tripleo_overcloud_node_import : Import node(s) -------- 34.78s

2022-07-21 00:29:10.665035 | primary | os_tempest : Install distro packages ----------------------------------- 29.98s

2022-07-21 00:29:10.665039 | primary | tripleo.operator.tripleo_overcloud_image_upload : Overcloud image upload -- 24.80s

2022-07-21 00:29:10.665044 | primary | build-test-packages : Pip install pre-installed DLRN ------------------- 18.00s

2022-07-21 00:29:10.665051 | primary | overcloud-prep-images : List overcloud flavors for Nova deployment ----- 16.91s

2022-07-21 00:29:10.665054 | primary | Gathering Facts -------------------------------------------------------- 15.64s

2022-07-21 00:29:10.665058 | primary | build-test-packages : Clean up loop devices created by mock ------------ 14.98s

2022-07-21 00:29:10.665066 | primary | build-test-packages : Check loop devices stat -------------------------- 14.18s

2022-07-21 00:29:10.665070 | primary | os_tempest : Executing python-tempestconf ------------------------------ 10.86s

2022-07-21 00:29:10.665073 | primary | modify-image : Extract initramfs image ---------------------------------- 9.49s

2022-07-21 00:29:10.665077 | primary | validate-perf : Install the latest version of dstat on overcloud -------- 9.24s

2022-07-21 00:29:10.665081 | primary | Add eth2 interface from eth2.conf --------------------------------------- 8.74s

2022-07-21 00:29:11.222806 | primary | +(./toci_quickstart.sh:161): main(): exit_value=4

2022-07-21 00:29:11.223360 | primary | +(./toci_quickstart.sh:164): main(): [[ 4 == 0 ]]

2022-07-21 00:29:11.223383 | primary | +(./toci_quickstart.sh:165): main(): [[ 4 != 0 ]]

2022-07-21 00:29:11.224419 | primary | +(./toci_quickstart.sh:165): main(): echo 'Playbook run of ovb.yml failed'

2022-07-21 00:29:11.225451 | primary | Playbook run of ovb.yml failed

2022-07-21 00:29:11.225486 | primary | +(./toci_quickstart.sh:165): main(): break

2022-07-21 00:29:11.228890 | primary | +(./toci_quickstart.sh:167): main(): [[ 4 == 0 ]]

2022-07-21 00:29:11.228917 | primary | +(./toci_quickstart.sh:167): main(): echo 'Playbook run failed'

2022-07-21 00:29:11.228924 | primary | Playbook run failed

2022-07-21 00:29:11.228932 | primary | +(./toci_quickstart.sh:170): main(): echo 'Quickstart completed.'

2022-07-21 00:29:11.228937 | primary | Quickstart completed.

2022-07-21 00:29:11.228941 | primary | +(./toci_quickstart.sh:171): main(): exit 4
```
The tempest tests are finishing successfully but due to 4 exit code, the job is failing.
It started happening from 2022-07-19 05:52:55. We donot know what caused the issue. It is a tracker bug.