hotfix: break circular termination lock #1688

Job	Run time
test-getting_started / tests	1m 57s
test-tutorials (configuration.ipynb) / tests	1m 47s
test-tutorials (debugging.ipynb) / tests	2m 4s
test-tutorials (describing_tasks.ipynb) / tests	2m 45s
test-tutorials (multiple_pilots.ipynb) / tests	2m 48s
test-tutorials (raptor.ipynb) / tests	2m 15s
test-tutorials (profiling.ipynb) / tests	2m 34s
test-tutorials (raptor_mpi.ipynb) / tests	3m 3s
test-tutorials (staging_data.ipynb) / tests	2m 11s
test-tutorials (submission.ipynb) / tests	1m 29s
	22m 53s

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