tripleo-ci-centos-8-scenario010-standalone is failing on tempest test with error 'Load Balancer is immutable and cannot be updated.'

Description:

tripleo-ci-centos-8-scenario010-standalone is failing on tempest test with error 'Load Balancer <> is immutable and cannot be updated.', 'debuginfo': None}

Some jobs failed:-

https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_beb/760080/2/check/tripleo-ci-centos-8-scenario010-standalone/bebdad4/job-output.txt

Sometimes job timed out:-

https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_c76/758627/37/check/tripleo-ci-centos-8-scenario010-standalone/c767d77/job-output.txt

But same type of error is observed:-

https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_beb/760080/2/check/tripleo-ci-centos-8-scenario010-standalone/bebdad4/logs/undercloud/var/log/tempest/tempest_run.log

~~~
Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2020-10-28 18:24:52,826 214423 INFO [tempest.lib.common.rest_client] Request (HealthMonitorScenarioTest:test_LC_PING_healthmonitor_CRUD): 409 POST http://192.168.24.3:9876/v2.0/lbaas/pools 0.108s
    2020-10-28 18:24:52,826 214423 DEBUG [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
            Body: {"pool": {"name": "tempest-lb_member_pool1_hm-721095081", "loadbalancer_id": "e8e7e3d4-1fbe-4ad7-99e4-e2230da7954b", "lb_algorithm": "LEAST_CONNECTIONS", "protocol": "TCP"}}
        Response - Headers: {'date': 'Wed, 28 Oct 2020 18:24:52 GMT', 'server': 'Apache', 'content-length': '147', 'x-openstack-request-id': 'req-3f1986f5-f927-4f70-8d7e-d5a846993f89', 'connection': 'close', 'content-type': 'application/json', 'status': '409', 'content-location': 'http://192.168.24.3:9876/v2.0/lbaas/pools'}
            Body: b'{"faultcode": "Client", "faultstring": "Load Balancer e8e7e3d4-1fbe-4ad7-99e4-e2230da7954b is immutable and cannot be updated.", "debuginfo": null}'

{1} octavia_tempest_plugin.tests.scenario.v2.test_healthmonitor.HealthMonitorScenarioTest.test_LC_TCP_healthmonitor_CRUD [0.104099s] ... FAILED
~~~

https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_c76/758627/37/check/tripleo-ci-centos-8-scenario010-standalone/c767d77/logs/undercloud/var/log/tempest/tempest_run.log

~~~
Captured traceback-1:
~~~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/usr/lib/python3.6/site-packages/octavia_tempest_plugin/services/load_balancer/v2/base_client.py", line 406, in _cleanup_obj
        self.delete, uri)
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/utils/test_utils.py", line 84, in call_and_ignore_notfound_exc
        return func(*args, **kwargs)
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/rest_client.py", line 329, in delete
        return self.request('DELETE', url, extra_headers, headers, body)
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/rest_client.py", line 702, in request
        self._error_checker(resp, resp_body)
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/rest_client.py", line 823, in _error_checker
        raise exceptions.Conflict(resp_body, resp=resp)
    tempest.lib.exceptions.Conflict: Conflict with state of target resource
    Details: {'faultcode': 'Client', 'faultstring': 'Load Balancer b24c7c20-87c7-4b31-b489-40a49165e503 is immutable and cannot be updated.', 'debuginfo': None}
~~~