title: Is addLast method on channel pipeline blocking?
body: <p>I am dynamically adding and removing handlers to a channel pipeline, but seems like some times the call to the addLast method might not have finished adding the handler because my fairly immediate call c.pipeline.last() seems to be be giving back null. i am wondering if i need to do move this to some kind of future listner? i am using netty 4.1.27</p>