Tests

Merge pull request #18877 from ivanvc/release-3.4-backport-18812 #15570

Job	Run time
test (linux-amd64-fmt)	57s
test (linux-amd64-integration-1-cpu)	9m 40s
test (linux-amd64-integration-2-cpu)	9m 22s
test (linux-amd64-integration-4-cpu)	9m 51s
test (linux-amd64-functional)	2m 16s
test (linux-amd64-unit-4-cpu-race)	52s
test (all-build)	3m 26s
test (linux-amd64-grpcproxy)	15m 20s
test (linux-amd64-e2e)	14m 5s
test (linux-386-unit)	44s
	1h 6m 33s

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