Next function returns own messages

[l0k18]

Sorry if this is a duplicate. It is happening with v0.9.3, which appears to be the current latest version.

The title really says it all. I added this code to my handler to abort doing any work if the sender is the receiver:

	if p.ReceivedFrom == ng.Listener.Host.ID() {
		return
	}

Yes, Listener.Host is libp2p.Host.

It seems to me that the Next function should not deliver messages that the pubsub sent. At least it should be an option to suppress it.

[vyzo]

This is the default behavior of broadcast protocols; a pr would be welcome if you want to add an option to disable this behavior.

[l0k18]

This is the default behavior of broadcast protocols; a pr would be welcome if you want to add an option to disable this behavior.

I will attach one to this issue in the near future, A parameter and that code more or less.