octavia.tests.functional.amphorae.backend.agent.api_server.test_server.TestServerTestCase.test_ubuntu_plug_network failed

[Gregory Thiemonge]

Random failure in the CI:

https://zuul.opendev.org/t/openstack/build/1fda6a362d21484896045b8e5041bdef

Job octavia-tox-functional-py37-tips
Change https://review.opendev.org/c/openstack/octavia/+/882278
Project openstack/octavia
Branch stable/wallaby

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Failed 1 tests - output below:
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octavia.tests.functional.amphorae.backend.agent.api_server.test_server.TestServerTestCase.test_ubuntu_plug_network
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Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):

      File "/home/zuul/src/opendev.org/openstack/octavia/octavia/tests/functional/amphorae/backend/agent/api_server/test_server.py", line 961, in test_ubuntu_plug_network
    self._test_plug_network(consts.UBUNTU)

      File "/usr/lib/python3.7/unittest/mock.py", line 1255, in patched
    return func(*args, **keywargs)

      File "/home/zuul/src/opendev.org/openstack/octavia/octavia/tests/functional/amphorae/backend/agent/api_server/test_server.py", line 1079, in _test_plug_network
    mock_open.assert_any_call(file_name, flags, mode)

      File "/usr/lib/python3.7/unittest/mock.py", line 942, in assert_any_call
    ) from cause

    AssertionError: open('/etc/octavia/interfaces/eth0.json', 577, 420) call not found