TestLeaseSocketService.test_processNotification_dont_allow_same_address flaky test

[Jacopo Rota]

Flasky test in CI

testtools.testresult.real._StringException: testtools.testresult.real._StringException: Seeds: {{{MAAS_RAND_SEED=d2c8221bd819b2f4 PYTHONHASHSEED=572605865}}}
Twisted logs: {{{<class 'provisioningserver.rackdservices.lease_socket_service.LeaseSocketService'> starting on '/tmp/tmpqvt3_pxi/dhcpd.sock'Starting protocol <provisioningserver.rackdservices.lease_socket_service.LeaseSocketService object at 0x7f5cee1d5c00>(Port '/tmp/tmpqvt3_pxi/dhcpd.sock' Closed)Stopping protocol <provisioningserver.rackdservices.lease_socket_service.LeaseSocketService object at 0x7f5cee1d5c00>}}}
twisted-log: {{{2023-07-07 09:23:53+0000 [-] Main loop terminated.}}}

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1660, in _inlineCallbacks
    result = current_context.run(gen.send, result)
  File "/run/build/checkout/src/provisioningserver/rackdservices/tests/test_lease_socket_service.py", line 192, in test_processNotification_dont_allow_same_address
    self.assertEqual(
  File "/usr/lib/python3.10/unittest/case.py", line 845, in assertEqual
    assertion_func(first, second, msg=msg)
  File "/usr/lib/python3.10/unittest/case.py", line 1062, in assertTupleEqual
    self.assertSequenceEqual(tuple1, tuple2, msg, seq_type=tuple)
  File "/run/build/checkout/src/maastesting/testcase.py", line 224, in assertSequenceEqual
    return super().assertSequenceEqual(seq1, seq2, msg, seq_type)
  File "/usr/lib/python3.10/unittest/case.py", line 1033, in assertSequenceEqual
    self.fail(msg)
  File "/usr/lib/python3.10/unittest/case.py", line 675, in fail
    raise self.failureException(msg)
AssertionError: Tuples differ: ({'cl[26 chars]s': [{'action': 'commit', 'mac': '38:d2:e2:9d:[121 chars]}]},) != ({'cl[26 chars]s': []},)

First differing element 0:
{'clu[25 chars]s': [{'action': 'commit', 'mac': '38:d2:e2:9d:[119 chars]2'}]}
{'clu[25 chars]s': []}

+ ({'cluster_uuid': None, 'updates': []},)
- ({'cluster_uuid': None,
- 'updates': [{'action': 'commit',
- 'hostname': 'host-rEWG72',
- 'ip': '250.102.58.187',
- 'ip_family': 'ipv4',
- 'lease_time': 30,
- 'mac': '38:d2:e2:9d:ff:74',
- 'timestamp': 1688721833}]},)

http://maas-ci.internal:8080/job/maas-tester/2930/consoleText