Implement -k argument in vut for use with varnishlog. This takes as an
argument the number of log transactions to be processed before
exiting. Useful to stop varnishlog after a given set of log data has
been produced.

Drop -s from the 'not implemented yet' list as this option has very
limited usefullness.

Submitted by:	fgs

might have, it doesn't make any sense.

Fixes	#1602

copy&paste.

Spotted by:	scn

each VMOD which asks.

Patch by:	mithrandir
Fixes #1600

A director is noe an abstract entity which can fetch something for us,
however it decides to do that and using whatever protocol (or none).

A backend is a network endpoint designated by a precise triplet of
	VCL backend name
	IPv4 address (incl port)
	IPv6 address (incl port)

Backends are _also_ "simple" directors, but have an extra layer of
complexity in order to enable connection management, including
connection reuse across vcl.use commands.

it's privates for it.

from the source code.  We now have a working documentation system
and these state engines should be documented there, using appropriate
tools.

Fixes	#1487

if we know the length to be zero.

This is inspired by ticket #1590, even though I can't seem to see what
Varnish does wrong in that case to begin with.

Fixes	#1590

and what's not in http headers.

Make http_GetHdrToken() return both start and end of tokendata so
we can chew on it without thinking about NUL vs. anything else.

Trouble is that sphinx only takes one source dir, but when we build
out-of-tree, we need to both use sources from $(srcdir) as well as
$(builddir).

Fix this by hard-linking from $(srcdir) to $(builddir) and wait for
someone to come up with an out-of-tree build on different file systems.

Fixes #1479

Fixes #1479

Note that each VMOD only gets one of each, so that the same 'vmod_priv'
will appear on all VMOD functions which use PRIV_REQ and similarly
only a single vmod_priv appear for all PRIV_SESS uses in that VMOD.

Feedback welcome.

gets too complicated.