message: Try fix flaky ZNCTest.AwayNotify
diff: @@ -264,6 +264,9 @@ TEST_F(ZNCTest, AwayNotify) {
  client.ReadUntil(":x!y@z AWAY :reason");
  ircd.Close();
  client.ReadUntil("DEL :away-notify");
  + // This test often fails on macos due to ZNC process not finishing.
  + // No idea why. Let's try to shutdown it more explicitly...
  + client.Write("znc shutdown");
  }
  TEST_F(ZNCTest, JoinKey) {
  