Ref varnish-cache c2d45aefb563bb105f524b67b84d20649ecb85a2

Nodes on the worklist are never nexus nodes.

These changes are still quite mechanic to pass the test suite. We should
go over them and possibly refactor more code.

Ref varnish-cache c9fc384202b418faed3f1768c0caa60ec26555e0

ref varnish-cache e9c2a488d291b3129838c411cac7312f8801ff1e

Ref varnish-cache 681c11998ec56dc4460a30585210f95a7850ea3b

Ref varnish-cache f087fe6d37679d8d709cfec85451fde4f68fbb95

Original patch by Poul-Henning Kamp <phk@FreeBSD.org>

and also make bereq.bodybytes account only for the actual bytes
in the body, not for the (chunked) overhead.

Ref varnish-cache dc37be044f1954b3c7dd497e3e7a5a06c5a9bc5a

Original patch by Poul-Henning Kamp <phk@FreeBSD.org>

Signed-off-by: Nils Goroll <nils.goroll@uplex.de>

Ref varnish-cache 2ab29dc47c1784748e46c60964ca86efa2cdd866

Signed-off-by: Nils Goroll <nils.goroll@uplex.de>

Ref https://github.com/varnishcache/varnish-cache/issues/3002

I'm no longer able to time it out under load.
Signed-off-by: Nils Goroll <nils.goroll@uplex.de>

Ref varnish-cache ccc1339e6628d6e545b8504d0a230a11f261e930

Ref varnish-cache 78c65ef9cc50f5b449bed1ac040322556c0183c7

Ref varnish-cache a67a9d5606210245dd0c51966698dcd07206c91e

... hopefully, finally

The previous code pushing additional data was actually working around
other bugs, which _should_ be fixed with
4f9db605 and
6b5c4e45 as shown by permutations.vtc

This should avoid running into #3109 on 6.x