struct http_conn usage changes

[Martin Blix Grydeland]

Hi PHK,

Attached is a set of patches to fix up the connection handling in Varnish,
making it more general for both client and backend connections. This is a
fairly benign cleanup set, that makes the code paths clearer. I propose
this for inclusion in 4.1 (and with very small font, almost unreadable, I
mention that it also sneaks in the necessary hooks for my Backend SSL
stuff).

Martin

-- 
<http://varnish-software.com>*Martin Blix Grydeland*
Senior Developer | Varnish Software AS
Mobile: +47 992 74 756
We Make Websites Fly!
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