on_disconnect & on_reconnect no longer supported in PubSub

[justinttl]

It looks like since #326, on_disconnect and on_reconnect are no longer used/ supported in the pubsub implementation. Should we remove the documentation and API around them?

[carltongibson]

Hi @justinttl thanks. From the description I'm going to say Yes. I need to look at the code to verify, but if you'd like to work on a PR that would be great. 🎁

[justinttl]

Sure, I can throw together the changes