Error: AMQJS0011E Invalid state already connected

[swgraham]

"Error: AMQJS0011E Invalid state already connected" out of mqttws31.js is thrown when the server configured for MQTT is unavailable. We should throw something better that makes more sense (since we aren't connected)

I suspect this has to do w/ the Retry logic if the connection goes down or doesn't work. Should not be hard to clean up.