Proposed patch to fix #972

[Martin Blix Grydeland]

After discussions with DocWilco and Tollef, we came to the conclusion that
disabling streaming when meeting the conditions for 304 is a better
solution.

Attached patch refactors the conditionals handling into a check and do
function, and performs an extra check and disables if met when do_stream is
true.

-Martin

-- 
Martin Blix Grydeland
Varnish Software AS
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