Don't allow publishing to an exchange that is not open. #402
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Prevents nasty issues like callbacks that are not fired when publisher confirmations are turned on, caused by broker-client acknowledgement sequencing mismatch.
Whenever a connection error occurs, if publisher confirmations are enabled, all currently unacked messages emit 'ack error' instead of not calling the callback altogether.
There also are two tests that don't pass for me on master, as well as on this branch.