Matt Joras cf783ae678 Replace IOBufQueue in retransmission buffer. ...

Summary:
`IOBufQueue` has some facilities for fast appending to the tail. This is not useful for us in the retransmission buffer usecase, and probably not at all. Flushing the tail cache from the `IOBufQueue` is expensive when we have to shuffle around the retransmission buffer queue on removal.

This diff replaces `IOBufQueue` with a bespoke version that only has some of the functionality.

This also changes the dependent peek APIs to use `IOBuf`s directly.

Reviewed By: siyengar, yangchi

Differential Revision: D18126437

fbshipit-source-id: a2fec0f45a72459855700c605bfd0d863a9067b7

2019-11-20 12:04:03 -08:00

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