deflake TestTracing

Signed-off-by: Chao Chen <chaochn@amazon.com>

tests/integration/tracing_test.go

@@ -70,7 +70,9 @@ func TestTracing(t *testing.T) {
 
 	select {
 	case <-etcdSrv.Server.ReadyNotify():
-	case <-time.After(1 * time.Second):
+	case <-time.After(5 * time.Second):
+		// default randomized election timeout is 1 to 2s, single node will fast-forward 900ms
+		// change the timeout from 1 to 5 seconds to ensure de-flaking this test
 		t.Fatalf("failed to start embed.Etcd for test")
 	}