Description of problem:

When FIPS is enabled, the Octavia TLS tests fail with a "The PKCS12 bundle is unreadable" exception

2022-07-19 23:04:35,003 307618 INFO     [tempest.lib.common.rest_client] Request (TLSWithBarbicanTest:test_alpn_fallback_tls_traffic): 400 POST https://10.0.0.142:13876/v2.0/lbaas/listeners 4.394s
2022-07-19 23:04:35,004 307618 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: {"listener": {"protocol": "TERMINATED_HTTPS", "protocol_port": "443", "loadbalancer_id": "27b2c96f-e454-44ef-8d88-39bfed884246", "name": "tempest-lb_member_listener1-tls-alpn-1345456376", "default_pool_id": "e4a4af46-8b21-4130-9d00-cff6e0925e34", "default_tls_container_ref": "https://10.0.0.142:13311/v1/secrets/a3cb9bbf-47a3-4fdd-9d00-9b6df7a26624", "alpn_protocols": ["http/1.0", "http/1.1"]}}
    Response - Headers: {'date': 'Tue, 19 Jul 2022 23:04:30 GMT', 'server': 'Apache', 'content-length': '250', 'x-openstack-request-id': 'req-3280923b-c93d-4aec-bcd8-2d575e572c63', 'content-type': 'application/json', 'connection': 'close', 'status': '400', 'content-location': 'https://10.0.0.142:13876/v2.0/lbaas/listeners'}
        Body: b'{"faultcode": "Client", "faultstring": "The PKCS12 bundle is unreadable. Please check the PKCS12 bundle validity. In addition, make sure it does not require a pass phrase. Error: [(\'digital envelope routines\', \'\', \'unsupported\')]", "debuginfo": null}'
}}}

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py", line 1113, in test_alpn_fallback_tls_traffic
    self._test_alpn_tls_traffic(s_protos, c_protos, expected)
  File "/usr/lib/python3.9/site-packages/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py", line 1152, in _test_alpn_tls_traffic
    listener = self.mem_listener_client.create_listener(**listener_kwargs)
  File "/usr/lib/python3.9/site-packages/octavia_tempest_plugin/common/decorators.py", line 42, in wrapper
    return f(*func_args, **func_kwargs)
  File "/usr/lib/python3.9/site-packages/octavia_tempest_plugin/services/load_balancer/v2/listener_client.py", line 127, in create_listener
    return self._create_object(**kwargs)
  File "/usr/lib/python3.9/site-packages/octavia_tempest_plugin/services/load_balancer/v2/base_client.py", line 101, in _create_object
    response, body = self.post(request_uri, jsonutils.dumps(obj_dict))
  File "/usr/lib/python3.9/site-packages/tempest/lib/common/rest_client.py", line 299, in post
    return self.request('POST', url, extra_headers, headers, body, chunked)
  File "/usr/lib/python3.9/site-packages/tempest/lib/common/rest_client.py", line 720, in request
    self._error_checker(resp, resp_body)
  File "/usr/lib/python3.9/site-packages/tempest/lib/common/rest_client.py", line 831, in _error_checker
    raise exceptions.BadRequest(resp_body, resp=resp)
tempest.lib.exceptions.BadRequest: Bad request
Details: {'faultcode': 'Client', 'faultstring': "The PKCS12 bundle is unreadable. Please check the PKCS12 bundle validity. In addition, make sure it does not require a pass phrase. Error: [('digital envelope routines', '', 'unsupported')]", 'debuginfo': None}


Version-Release number of selected component (if applicable):
17.0

How reproducible:
100%

Steps to Reproduce:
1. deploy OSP17 with FIPS
2. run the TLS tests from octavia-tempest-plugin (TLSWithBarbicanTest)
3.