Unstuck provenance diff build hanging and then aborted

Master build is fine [1] Diff build [2] on top of the master is hanging and gets aborted for some reason. The only difference in between the master commit and the diff commit is about the new pulled swh.journal dependency.

Although the diff build seems to hang around the test_provenance_storage_content[rabbitmq] with rabbitmq somehow.

• [1] https://jenkins.softwareheritage.org/job/DPROV/job/tests/765/console

• [2] https://jenkins.softwareheritage.org/job/DPROV/job/tests-on-diff/619/console

• [3]

# diff hanging then killed
11:22:37  .tox/py3/lib/python3.7/site-packages/swh/provenance/tests/test_provenance_storage.py::test_provenance_storage_content[rabbitmq-with-path-denormalized] PASSED [ 27%]
11:35:35  Cancelling nested steps due to timeout
11:35:35  .tox/py3/lib/python3.7/site-packages/swh/provenance/tests/test_provenance_storage.py::test_provenance_storage_content[rabbitmq-without-path-denormalized] Sending interrupt signal to process
11:35:43  Terminated
11:35:43  ERROR: Got SIGTERM, handling it as a KeyboardInterrupt
11:35:43  ERROR: got KeyboardInterrupt signal

# master build ok around the same test
11:13:17  .tox/py3/lib/python3.7/site-packages/swh/provenance/tests/test_provenance_storage.py::test_provenance_storage_content[rabbitmq-without-path-denormalized] PASSED [ 27%]
11:13:18  .tox/py3/lib/python3.7/site-packages/swh/provenance/tests/test_provenance_storage.py::test_provenance_storage_directory[mongodb-with-path] PASSED [ 27%]

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Migrated from T4361 (view on Phabricator)