Tests

release: properly change working dir if tmp location already exists #1019

Job	Run time
test (linux-amd64-fmt)	56s
test (linux-amd64-integration-1-cpu)	4m 51s
test (linux-amd64-integration-2-cpu)	9m 21s
test (linux-amd64-integration-4-cpu)	9m 35s
test (linux-amd64-functional)	8m 0s
test (linux-amd64-unit-4-cpu-race)	51s
test (all-build)	3m 30s
test (linux-amd64-grpcproxy)	15m 31s
test (linux-amd64-e2e)	14m 25s
test (linux-386-unit)	41s
	1h 7m 41s

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