fix subscription channel set twice for replyTo case #128
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For Subscribe, when ReplyTo header is set, the response channel will be set in the channel map twice in function processLoop.
Then if an ERROR frame is received, that response channel will be in the loop twice, the first time it will be closed, the second time will trigger panic for sending to closed channel.
Fix by force id to be equal to ReplyTo header value, and use the same trick to remove it from the channel map.