Streaming part 1 (separate fetch thread, no multi-client)

[Martin Blix Grydeland]

Hi Poul-Henning & varnish-dev,

Please find attached a series of patches implementing the background fetch
thread streaming. Multi-client streaming is coming later. Any comments
appreciated.

Regards,
Martin Blix Grydeland

-- 
Martin Blix Grydeland
Varnish Software AS
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