Add ability to prevent logging of peer-disconnect messages

[ar]

On one-shot connections, the peer-disconnect message can become annoying. We should have the ability to prevent logging them.

[alcarraz]

Maybe adding a LogListener that can take care of filtering BaseChannel produced log events?

It can be configured to filter given events.

ChannelFilterLogListener? or maybe a more general-purpose one?

[ar]

That's one way to solve it, but I think it's an annoying enough log event that we can handle at BaseChannel level configuration.