Subodh Iyengar 7ad8cea407 Remove iobufqueue from packetbuilder ...

Summary:
Get rid of IObufQueue usage in the PacketBuilder and replace it with a vanilla IOBuf.

This requires replacing QueueAppender with something else as well, so this diff adds a new class call BufAppender which does exactly the same things as a QueueAppender.

Having a BufAppender will allow us to avoid cloning the stream buffer in the future and avoid a clone during the write path.

Reviewed By: mjoras

Differential Revision: D18673517

fbshipit-source-id: 31fd7758688686371d038111514eb62d6b21672c

2019-11-28 21:38:28 -08:00

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