Fixes #1801.

Indentation while I'm here.

Fixes	#1813

This is consistent with what we do in other cases.

If we send the backend a HTTP/1.0 request, and it doesn't have a
Content-Length, it cannot use Chunked and must fall back to EOF.

However, the protocol field in the response tells us what version
backend *could* have used, not what it *does* use.

So we can get a response with HTTP/1.1 and EOF, following HTTP/1.0
semantics - because we asked for it.

Most sensible backends avoid this, either by buffering and creation
of a C-L or, smartly, returning "HTTP/1.0", even though that
is strictly speaking against the apocrphal texts.

Anyway, now we cope...

Fixes: 	#1810

Fixes:	#1796
Also triggered by:	The Wemm-Field

The proxy log records were attempted to be logged on the request' log
buffer, which at that point in time has not yet been set up and does
not posess a VXID. This caused VXID==0 log records to be inserted in
the beginning of the log for the first request on the session when
using proxy protocol, and subsequently the VSL to fail picking them
out as valid request log transactions.

Fix by logging the PROXY handling related messages on the session, in
which they belong.

Fixes: #1804

Change SIGHUP handling depending on whether we're running in daemon mode
or foreground. The former will continue rotating the logs, the latter
will abort the loop and die gracefully.

Fixes #1794.

Fixes #1809.

Found by ingvar while packaging 4.1.0.

Use `python' as with the other Python scripts.

makes work for it.  Have it sleep as long as possible, rather
than hot-polling for work to do.

Amazingly JEMALLOC didn't spot this one.

from the data structure we use to store and operate on the ban (ban).

on the ban lurker not starting.

Move cache_hash's access to bans into cache_priv.h

No functional changes.

This reverts commit ed6dca6b.
abandon in vcl_backend_* will take us to vcl_synth{}.

make somewhat more predictable.

Disable syslogging when we're running under varnishtest.

panic_string to syslog until we have washed it.

Previously it said `vcl_all' which doesn't exist.  Minor cosmetics while
I'm here.

Partially addresses #1795.