Merge pull request #8251 from heyitsanthony/whitelist-wg-done

testutil: whitelist WaitGroup.Done

pkg/testutil/leak.go

@@ -118,6 +118,7 @@ func interestingGoroutines() (gs []string) {
 		}
 		stack := strings.TrimSpace(sl[1])
 		if stack == "" ||
+			strings.Contains(stack, "sync.(*WaitGroup).Done") ||
 			strings.Contains(stack, "created by os/signal.init") ||
 			strings.Contains(stack, "runtime/panic.go") ||
 			strings.Contains(stack, "created by testing.RunTests") ||