as an interrim measure.

Use it in a few test-cases where it relates only to the backend
fetch (as opposed to pass/purge/restart)

value of .initial to equal .threshold.

The default for .initial is now .threshold - 1, meaning that the backend
starts up as sick and a single successful poll is required for it to be
considered healthy.

With the previous behaviour, a sick backend would not be considered sick
until after the initial polls exit the polling window.

Thanks to Colin Curtin.

Fixes: #1227

(out limit) characters long.

Fixes: #1274

Test case by: Dag Haavi Finstad

Fixes: #1275

Test case by: Dag Haavi Finstad

With fix for #1275 we can now do a proper 503 when malformed
Vary-headers are received from backend. Error out instead of accepting
bogus ':'.

headers, and do 503 on parse error.

Fixes: #1284

Fixes: #1283

the core code.

In the future directors belong in VMODs, which takes the need to
hack VCC code out of the learning-curve.

Certain directors have already been moved to VMODs, others will
need a bit of brain-surgery before they go there.

This commit is to get them out of the way for V4

VCL::fini cleanup

Remove a bunch of ifdef code and fix up proper configure check for
libedit.

Fixes #1277

these now live in VMOD.directors (and can be stacked :-)

Fixes #1273

will need.

builtin define for it.

From:	"Federico G. Schwindt" <fgsch@lodoss.net>

it is no longer a demo, it is going to replace the "built-in" rr
director.

Other directors will follow as time permits.