Test downstream projects

Use asyncio.Lock around subshell message handling #2082

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Run time

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Job	Run time
nbclient	2m 30s
jupyter_kernel_test	55s
qtconsole	3m 22s
ipywidgets	57s
jupyter_client	5m 40s
ipyparallel	0s
spyder_kernels	-1s
	13m 23s