zombie stream keeps libuv loop alive in some cases #181
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fix use a circular linked list queue for stream in-flight and retransmit queues. the changes were cherry picked from the rack fix branch.
this should fix a bug where a stream is not ended and closed due to NULL's in the udx-fifo retransmit queue. The stream would be kept alive since it appears that the stream still has packets to retransmit, actually the packets were SACKed.