This is an additional safeguard against regressions of #1762

We spilled into the client marker bit when reaching 1<<30

Master commits:
a87b589b
0dd8c0b8

backport of master cfb309ca

Original commit Author: Poul-Henning Kamp <phk@FreeBSD.org>

Fixes #1742

Follows from the discussion of 49712a5f on varnish-dev@.

The development package contains vmodtool.py, which works better
if the interpreter is available.

It used to be possible to specify -sfile size in percentage. This
feature has been removed. Update the users guide to reflect this.

Fixes: #1744

Debian (and Ubuntu) add --disable-maintainer-mode to configure
when building packages, leading to a unrecognised argument warning.

Adding AM_MAINTAINER_MODE disabled keeps the current behavior while
removing the warning.

Fix up a test case that ended sending duplicate headers by misstake

Use this when checking for duplicate Host headers

Add a common content length parser that is being used by both client
and backend side.

Original patch by: fgs

Fixes: #1691

Original patch: fgs

Fixes: #1602

gzip

Varnishtest:
NUL terminate the ungzip'ed body so we can expect on it.

Fixes #1688

This reverts commit faee84e0.

VRT_CTX is important at compile-time, not run-time, which this
version marker is all about.

Details in afbe27c0.

This a backport of f9aa6281 in master.

Fixes #1665.

Fixes #1462

Spotted by: gquintard

Fixes: #1637

Fixes: #1672

Conflicts:
	bin/varnishd/cache/cache_fetch.c

Conflicts:
	bin/varnishd/cache/cache_fetch.c

This state could be set by the expiry timer even though a reference is
grabbed during lookup, causing the assertion to trigger.

Fixes: #1539