TestDynamicDNSUpdate.test_as_reverse_record_update flaky test

[Jacopo Rota]

Flasky test in CI

[2023-07-06T12:15:16.318Z] FAIL: provisioningserver.dns.tests.test_config.TestDynamicDNSUpdate.test_as_reverse_record_update
[2023-07-06T12:15:16.318Z] provisioningserver.dns.tests.test_config.TestDynamicDNSUpdate.test_as_reverse_record_update
[2023-07-06T12:15:16.318Z] ----------------------------------------------------------------------
[2023-07-06T12:15:16.318Z] testtools.testresult.real._StringException: testtools.testresult.real._StringException: Empty attachments:
[2023-07-06T12:15:16.318Z] Twisted logs
[2023-07-06T12:15:16.318Z]
[2023-07-06T12:15:16.318Z] Seeds: {{{MAAS_RAND_SEED=56616418ebc3f417 PYTHONHASHSEED=4188324123}}}
[2023-07-06T12:15:16.318Z]
[2023-07-06T12:15:16.318Z] Traceback (most recent call last):
[2023-07-06T12:15:16.318Z] File "/run/build/checkout/src/provisioningserver/dns/tests/test_config.py", line 729, in test_as_reverse_record_update
[2023-07-06T12:15:16.318Z] answer=str(IPAddress(subnet.next())),
[2023-07-06T12:15:16.318Z] File "/usr/lib/python3/dist-packages/netaddr/ip/__init__.py", line 1251, in next
[2023-07-06T12:15:16.318Z] ip_copy += step
[2023-07-06T12:15:16.318Z] File "/usr/lib/python3/dist-packages/netaddr/ip/__init__.py", line 1102, in __iadd__
[2023-07-06T12:15:16.318Z] raise IndexError('increment exceeds address boundary!')
[2023-07-06T12:15:16.318Z] IndexError: increment exceeds address boundary!
[2023-07-06T12:15:16.318Z]
[2023-07-06T12:15:16.318Z]
[2023-07-06T12:15:16.318Z] ----------------------------------------------------------------------
[2023-07-06T12:15:16.318Z] Ran 17629 tests in 819.189s

http://maas-ci.internal:8080/job/maas-tester/2915/consoleText