TestRegionHTTPService.test_data_is_consistent_when_notified flaky test

[Jacopo Rota]

testtools.testresult.real._StringException: testtools.testresult.real._StringException: Seeds: {{{MAAS_RAND_SEED=38bfb18a595a13a7 PYTHONHASHSEED=3591694609}}}
Twisted logs: {{{Register on sys_reverse_proxy with handler <function TestRegionHTTPService.test_data_is_consistent_when_notified.<locals>._handler at 0x7fc156836e60>Register Channel sys_reverse_proxyListening for database notifications.Connection closed.Unregister on sys_reverse_proxy with handler <function TestRegionHTTPService.test_data_is_consistent_when_notified.<locals>._handler at 0x7fc156836e60>}}}

Traceback (most recent call last):
  File "/run/build/checkout/src/maastesting/crochet.py", line 149, in wrapper
    return eventual_result.wait(timeout)
  File "/usr/lib/python3/dist-packages/crochet/_eventloop.py", line 198, in wait
    result.raiseException()
  File "/usr/lib/python3/dist-packages/twisted/python/failure.py", line 475, in raiseException
    raise self.value.with_traceback(self.tb)
  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/maasserver/regiondservices/tests/test_http.py", line 240, in test_data_is_consistent_when_notified
    self.assertEqual(capture, ["sys_reverse_proxy"])
  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 1051, in assertListEqual
    self.assertSequenceEqual(list1, list2, msg, seq_type=list)
  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: Lists differ: [] != ['sys_reverse_proxy']

Second list contains 1 additional elements.
First extra element 0:
'sys_reverse_proxy'

- []
+ ['sys_reverse_proxy']

http://maas-ci.internal:8080/job/maas-tester/3063/testReport/maasserver.regiondservices.tests.test_http/TestRegionHTTPService/test_data_is_consistent_when_notified/

[Jerzy Husakowski (jhusakowski)]

Since it occurred only once, setting to incomplete in wait for another such occurrence.