Tests

Merge pull request #18878 from ivanvc/release-3.4-backport-18649 #15572

Job	Run time
test (linux-amd64-fmt)	56s
test (linux-amd64-integration-1-cpu)	9m 53s
test (linux-amd64-integration-2-cpu)	9m 37s
test (linux-amd64-integration-4-cpu)	9m 41s
test (linux-amd64-functional)	1m 31s
test (linux-amd64-unit-4-cpu-race)	51s
test (all-build)	3m 40s
test (linux-amd64-grpcproxy)	15m 5s
test (linux-amd64-e2e)	14m 20s
test (linux-386-unit)	40s
	1h 6m 14s

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