RabbitMQ transport: reconnect

[vetcher]

Right now, when connection to broker drops, there is no way to reconnect and restore channels functionality. Also, as I see, chan []bytes created by vice.Transport blocks forever after disconnection.

I can propose pull request (like here), but not at this moment.

What you think?

[matryer]

Would it be possible to add this situation into the global interface test? That way, we can see what’s going on with it, and also make sure other transports behave properly too.

[vetcher]

@matryer check #51, I added small test and comments above to show the problem