Merge pull request #8284 from heyitsanthony/whitelist-close

testutil: whitelist os.(*file).close

pkg/testutil/leak.go

@@ -119,6 +119,7 @@ func interestingGoroutines() (gs []string) {
 		stack := strings.TrimSpace(sl[1])
 		if stack == "" ||
 			strings.Contains(stack, "sync.(*WaitGroup).Done") ||
+			strings.Contains(stack, "os.(*file).close") ||
 			strings.Contains(stack, "created by os/signal.init") ||
 			strings.Contains(stack, "runtime/panic.go") ||
 			strings.Contains(stack, "created by testing.RunTests") ||