Raise a ParseError exception if not.

Fixes #1885.

When varnishtest creates a socket barrier, it will bind a socket and
listen to incoming connections. Once the number of expected connections
is open, connections are closed.

Barrier users only need to connect to the socket, read "nothing" and
block until the connection is closed. It allows virtually any process
to sync with varnishtest. The barrier will provide macros with its
socket information.

This is similar ASSERT_CLI, in order to make socket barriers creation
thread-safe.

This is useful in HTTP loops where it's impossible to predict and use an
array of barriers. All cycles expect the same number of waiters, unlike
semaphores.

They work like semaphores, except that they need explicit initialization
and can optionally be shared between processes.

 Conflicts:
	bin/varnishtest/tests/c00073.vtc

With this you can also filter based on logexpect's vsl arguments.

pattern in the body.

As suggested by Przemek Sobstel on github.

Spotted by: hermunn

In most circumstances the counters vsm_overflow and vsm_overflowed
should be zero. This patch tells the user what he should probably do
when they are not.

(and test the commit email hook)

(But mostly for testing the commit email system.)

Submitted by:	rezan
Fixes:		#1931

Disabled by default.  phk@ ok.

Fixes: #1967

... in order to actually use it by default

fixes #1971

Commit e142a199 for Issue #1918 fixed up the case where the
server sends an HTTP/1.1 response with no Content-Length, no
Transfer-Encoding, but with Connection:close.

This fixes the very similar case where all the conditions are the
same except that there's also no Connection: close header, but the
content is still implicitly delimited by the server closing the
connection.

This behavior has been observed from multiple versions of Apache
with WSGI applications behind it, resulting in broken
Content-Length:0 responses from Varnish.

Ref: varnishcache/varnish-cache#1954

Ref: #1847

Ref: #1873

Fixes #1873

Ref: #1806

Ref: #1955

This might happen during pass'd requests or in a multi-tier setup.
Fixes #1955.

Ref: #1855

Early version of the patch OK'd by martin@.

Fixes #1855.

Ref: #1928

Fixes #1928

Conflicts:
	bin/varnishd/http1/cache_http1_fsm.c

When allocating ESI memory through objallocwithnuke, tell the sevedore
in storage_simple.c that getting less than requested, is not
interesting.

Fixes #1941

This is a back port of #1961

Ref: #1813
Ref: #1810
Ref: #1807
Ref: #1804
Ref: #1801
Ref: #1796
Ref: #1794