Cleaner startup when there are tool problems. #3495

Job	Run time
build-client / build-client	9m 56s
setup-selenium / setup_chromedriver	3s
Test (3.8, 0)	42m 22s
Test (3.8, 1)	55m 39s
Test (3.8, 2)	52m 21s
	2h 40m 21s

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